Book 1

A Spy in the House

by Y.S. Lee

Published 6 April 2009

A colourful, action-packed Victorian detective novel centred around the exploits of "agent" Mary Quinn.

At a young age, Mary is rescued from the gallows by a woman masquerading as a prison warden. She is taken to Miss Scrimshaw's Academy for Girls. The school, Mary learns, is a front for a private investigation agency and, at 17, she is taken on as an agent. In her new role she is catapulted into the family home of the Thorolds to investigate the shady business dealings of Mr Thorold.


Book 2

The Body at the Tower

by Y.S. Lee

Published 6 September 2010

Another colourful, action-packed Victorian detective novel about the exploits of agent Mary Quinn

At a young age, Mary Quinn is rescued from the gallows and taken to Miss Scrimshaw's Academy for Girls. The school turns out to be a front for a private detective agency. At age 17, Mary takes on her first case (A Spy in the House). In this, the second book of the series, Mary Quinn sets out to uncover the truth behind a suspicious death at St Stephen's Tower, better known as the clock tower of the Houses of Parliament. The accident occurred after hours in a highly public part of town and despite the presence of night watchmen. Mary, disguised as Mark Quinn, becomes a builder's assistant to find out the truth about the body at the tower.


Book 2

Mary’s second adventure as an undercover agent forces her to relive some harrowing childhood experiences as she seeks the identity of a murderer.

Mary Quinn is back, now a trusted member of the Agency, the all-female detective unit operating out of Miss Scrimshaw’s Academy for Girls. Her new assignment sends her into the grimy underbelly of Victorian London dressed as a poor boy, evoking her own childhood memories of fear, hunger, and constant want. As she insinuates herself into the confidence of several persons of interest, she encounters others in desperate situations and struggles to make a difference without exposing — or losing — her identity. Mary’s adventure, which takes place on the building site of the clock tower of the Houses of Parliament, offers a fictional window into a fascinating historical time and place.

Book 3

The Traitor in the Tunnel

by Y.S. Lee

Published 26 February 2013

Book 3

Get steeped in suspense, romance, and high Victorian intrigue as Mary goes undercover at Buckingham Palace — and learns a startling secret at the Tower of London.

Queen Victoria has a little problem: there’s a petty thief at work in Buckingham Palace. Charged with discretion, the Agency puts quickwitted Mary Quinn on the case, where she must pose as a domestic while fending off the attentions of a feckless Prince of Wales. But when the prince witnesses the murder of one of his friends in an opium den, the potential for scandal looms large. And Mary faces an even more unsettling possibility: the accused killer, a Chinese sailor imprisoned in the Tower of London, shares a name with her long-lost father. Meanwhile, engineer James Easton, Mary’s onetime paramour, is at work shoring up the sewers beneath the palace, where an unexpected tunnel seems to be very much in use. Can Mary and James trust each other (and put their simmering feelings aside) long enough to solve the mystery and protect the Royal Family? Hoist on your waders for Mary’s most personal case yet, where the stakes couldn’t be higher — and she has everything to lose.

Book 4

The Agency 4: Rivals in the City

by Y.S. Lee

Published 10 March 2015
In a tale steeped in action, romance, and the gaslit intrigue of Victorian London, Mary Quinn’s detective skills are pitted against a cunning and desperate opponent.

Mary Quinn has a lot on her mind. James Easton, her longtime love interest, wants to marry her; but despite her feelings, independent-minded Mary hesitates. Meanwhile, the Agency has asked Mary to take on a dangerous case: convicted fraudster Henry Thorold is dying in prison, and Mary must watch for the return of his estranged wife, an accomplished criminal herself who has a potentially deadly grudge against James. Finally, a Chinese prizefighter has arrived in town, and Mary can’t shake a feeling that he is somehow familiar. With the stakes higher than ever, can Mary balance family secrets, conflicting loyalties, and professional expertise to bring a criminal to justice and find her own happiness?