Book 1

Killing Trail

by Margaret Mizushima

Published 8 December 2015
NOMINATED FOR RT BOOK REVIEW'S REVIEWER'S CHOICE AWARD FOR BEST FIRST MYSTERY

When a young girl is found dead in the mountains outside Timber Creek, life-long resident Officer Mattie Cobb and her partner, K-9 police dog Robo, are assigned to the case that has rocked the small Colorado town.

With the help of Cole Walker, local veterinarian and a single father, Mattie and Robo must track down the truth before it claims another victim. But the more Mattie investigates, the more she realizes how many secrets her hometown holds. And the key may be Cole's daughter, who knows more than she's saying.

The murder was just the beginning, and if Mattie isn't careful, she and Robo could be next. Suspenseful and smart, Killing Trail is a gripping read that will have readers clamoring for more Mattie and Robo for years to come. Fans of Nevada Barr and C.J. Box will love this explosive debut.

Book 2

Stalking Ground

by Margaret Mizushima

Published 13 September 2016
“A taut page-turner on multiple levels.” —Booklist
“Dog lovers will want to read this thriller.” —Library Journal

In this follow-up to Killing Trail, a murder investigation takes Mattie Cobb and her canine partner to the Colorado mountains—where the brutal winter landscape conceals an equally brutal killer.

When Deputy Ken Brody’s sweetheart goes missing in the mountains outside Timber Creek, Mattie Cobb and Robo are called to search. But it’s mid-October and a dark snow storm is brewing over the high country—and they’re already too late. By the time they find her body, the storm has broken and the snow is coming down hard.

While Brody hikes down to bring back the forensics team and veterinarian Cole Walker gathers supplies to protect them from the storm, Mattie and Robo find themselves alone, guarding the gravesite overnight in the dead of the early winter. And that’s only the first long, dark night in a series of them, because as their investigation develops, Mattie, Robo, Brody, and Cole find themselves in the middle of the killer’s stalking ground—with no way out unless they can catch a predator more deadly than any natural threat.

Filled with tension, excitement, and heart, this new installment in Mizushima’s much lauded series will send a chill down every reader's spine.

Book 3

Hunting Hour

by Margaret Mizushima

Published 8 August 2017
Finalist for “Best Mystery,” RT Reviewer’s Choice Award
An RT Book Reviews “Top Pick”
Finalist for “Best Mystery,” Colorado Book Award

When the daughter of Mattie’s on-again, off-again love interest disappears, she and her K-9 partner race to find the missing girl—before it’s too late.

Deputy Mattie Cobb is in a dark place and has withdrawn from Cole Walker and his family to work on issues from her past. When she and her K-9 partner, Robo, get called to track a missing junior high student, they find the girl dead on Smoker’s Hill behind the high school, and Mattie must head to the Walker home to break the bad news. But that’s only the start of trouble in Timber Creek, because soon another girl goes missing—and this time it’s one of Cole’s daughters.

Knowing that each hour a child remains missing lessens the probability of finding her alive, Mattie and Robo lead the hunt while Cole and community volunteers join in to search everything—to no avail. It seems that someone has snatched all trace of the Walker girl from their midst, including her scent. Grasping at straws, Mattie and Robo follow a phoned-in tip into the dense forest, where they hope to find a trace of the girl and rescue her alive. But when Robo does catch her scent, it leads them to information that challenges everything they thought they knew about the case.

Mattie and Robo must rush to hunt down the kidnapper before they’re too late in Hunting Hour, the heart-pounding third installment in Margaret Mizushima’s exhilarating Timber Creek K-9 mysteries.

Book 4

Burning Ridge

by Margaret Mizushima

Published 11 September 2018
Featuring Mattie Cobb and her K-9 police dog partner Robo, Burning Ridge by critically acclaimed author Margaret Mizushima is just the treat for fans of Alex Kava

On a rugged Colorado mountain ridge, Mattie Cobb and her police dog partner Robo make a grisly discovery—and become the targets of a ruthless killer.

Colorado’s Redstone Ridge is a place of extraordinary beauty, but this rugged mountain wilderness harbors a horrifying secret. When a charred body is discovered in a shallow grave on the ridge, officer Mattie Cobb and her K-9 partner Robo are called in to spearhead the investigation. But this is no ordinary crime—and it soon becomes clear that Mattie has a close personal connection to the dead man. 

Joined by local veterinarian Cole Walker, the pair scours the mountaintop for evidence and makes another gruesome discovery: the skeletonized remains of two adults and a child. And then, the unthinkable happens. Could Mattie become the next victim in the murderer’s deadly game? 

A deranged killer torments Mattie with a litany of dark secrets that call into question her very identity. As a towering blaze races across the ridge, Cole and Robo search desperately for her—but time is running out in Margaret Mizushima’s fourth spine-tingling Timber Creek K-9 mystery, Burning Ridge.

Best Books of 2018, Kings River Life
Winner, Next Generation Indie Book Awards, action-adventure
Silver Award, IBPA Benjamin Franklin Book Awards, mystery
Bronze Award, Foreword Indies Book of the Year Awards, mystery
Finalist, Colorado Book Awards, mystery

Book 5

Tracking Game

by Margaret Mizushima

Published 12 November 2019
A Library Reads “Top Pick”
Finalist, Colorado Book Awards, Mystery

“Another compelling mystery” in Timber Creek’s “vivid Colorado setting” that is “sure to appeal to fans of Margaret Coel or Nevada Barr” (Shelf Awareness)

Two brutal murders, a menacing band of poachers, and a fearsome creature on the loose in the mountains plunge Mattie Cobb and her K-9 partner Robo into a sinister vortex.

An explosion outside a community dance sends Mattie Cobb and Cole Walker reeling into the night, where they discover a burning van and beside it the body of outfitter Nate Fletcher. But the explosion didn't kill Nate—it was two gunshots to the heart.

The investigation leads them to the home of rancher Doyle Redman, whose daughter is Nate’s widow, and the object of one of their suspect’s affection. But before they can make an arrest, they receive an emergency call from a man who’s been shot in the mountains. Mattie and Robo rush to the scene, only to be confronted by the ominous growl of a wild predator.

As new players emerge on the scene, Mattie begins to understand the true danger that’s enveloping Timber Creek. They journey into the cold, misty mountains to track the animal—but discover something even more deadly in Tracking Game, the fifth installment in Margaret Mizushima's Timber Creek K-9 mysteries.

Book 6

Hanging Falls

by Margaret Mizushima

Published 8 September 2020
Winner: WILLA Literary Award for Fiction, Contemporary Fiction
Silver Award: IBPA Benjamin Franklin Awards, Mystery
Finalist: Colorado Authors League, Mystery

Reunite with Officer Mattie Cobb and her canine companion, Robo, in the sixth gripping installment of the Timber Creek K-9 mysteries—“guaranteed to delight every dog lover” (Booklist)

Murder stalks the rugged Colorado high country—and sends Mattie Cobb on a quest to uncover the darkest secrets from her past.

A deluge has flooded the high ground near Hanging Falls—but heavy rains aren’t the only menace descending on Timber Creek. While on a scouting mission to pinpoint trail damage, officer Mattie Cobb and her K-9 partner Robo stumble upon a body floating at the edge of a lake. Robo catches human scent, which leads to an enigmatic forest-dweller who quickly becomes suspect number one.

With help from veterinarian Cole Walker, Mattie identifies the victim, and discovers an odd religious cult whose dress and manners harken back to the 19th century. As the list of suspects grows, an unexpected visit from members of Mattie’s long-lost family sheds new light on her childhood as they help Mattie piece together details of the fateful night when she was abducted at age two.

The tangled threads of the investigation and family dynamics begin to intertwine—but darkness threatens to claim a new victim before Mattie and Robo can track down the killers.

Book 7

Striking Range

by Margaret Mizushima

Published 7 September 2021
A deadly secret is buried in the Colorado high country--and murder is only the beginning in the seventh gripping installment of Margaret Mizushima's Timber Creek K-9 mysteries.

He was suspect number one--the man who tried to kill Deputy Mattie Cobb and may have killed her father thirty years earlier. But when Mattie and cold case detective Jim Hauck reach the Colorado state prison where they will finally get to interview him, he's found dead in his cell. There's only one clue: a map leading to Timber Creek and rugged Redstone Ridge.

Though she usually works with veterinarian Cole Walker, Mattie's K-9 partner Robo has just sired a litter of pups, who require special, time-consuming care at Cole's clinic. Left to explore the map's clue without him, Mattie and Robo journey into the burned forest surrounding Redstone Ridge. But before they can finish their search they're called to help investigate the death of a young woman found in a campground filled with elk hunters. Identification of the deceased points to her having recently given birth, but the infant is nowhere to be found.

As a deadly storm descends upon the mountains, covering everything with a layer of ice and snow, Mattie and her team search for the missing newborn. The storm batters the area, taking its toll on the team and forcing the sheriff to call in reinforcements. When new evidence surfaces, they decide that finding the woman's killer will lead them to her baby, making them even more desperate to solve the case.

Then Cole goes missing, stranded alone in the high country with a person that Mattie now suspects is the mastermind behind several murders, including her father's. She and Robo take to the trail to find Cole--but the killer has a cold-blooded plan that threatens them all.

Book 8

Standing Dead

by Margaret Mizushima

Published 7 March 2023
From critically acclaimed, master thriller author Margaret Mizushima, comes the eighth installment of the award-winning Timber Creek K-9 mysteries.

“Tense and satisfying,” (JA Jance) Standing Dead is the perfect read for fans of CJ Box and Longmire.

Deputy Mattie Cobb and her sister, Julia, travel to Mexico to visit their mother, but when they arrive, they discover that she and her husband have vanished without a trace. Back in Timber Creek, Mattie finds a chilling note on her front door telling her to look for “him” among the standing dead up in the high country.
 
The sheriff’s department springs into action and sends a team to the mountains, where Mattie’s K-9 partner, Robo, makes a grisly discovery—a body tied to a dead pine tree. Mattie is shocked when she realizes she knows the dead man. And then another note arrives, warning that Mattie’s mother is in desperate straits. In a last-ditch gambit, Mattie must go deep undercover into a killer’s lair to save her mother—or die trying.

Book 9

Gathering Mist

by Margaret Mizushima

Published 8 October 2024
Secrets hide within the fog deep in the mossy forests of the Pacific Northwest in this ninth thrilling installment in award-winning author Margaret Mizushima’s Timber Creek K-9 mystery series.

Deputy Mattie Wray, formerly Mattie Cobb, is summoned to Washington’s Olympic peninsula for an urgent search and rescue mission to find a celebrity’s missing child. With only a week left before her wedding, Mattie is hesitant to leave Timber Creek, but her K-9 partner Robo’s tracking skills are needed.

Dense forest, chilling rain, and unfriendly locals hamper their efforts, and soon Mattie suspects something more sinister than a lost child is at play.  When one of the SAR dogs becomes ill, her fiancé, Cole Walker, suspects poison. Fearing for Mattie’s and Robo’s safety, Cole joins the search and rescue team as veterinary support.

Secrets that have lain hidden within the rugged terrain come to light, and when it is uncovered that the missing child was kidnapped, the search becomes a full-blown crime scene investigation, forcing Mattie, Robo, and Cole into a desperate search to find the missing child before it's too late.