Book 1

Boundary

by Eric Flint

Published 7 March 2006
What is a paleontologist doing on Mars? Pushing her boundaries...

Book 2

Threshold

by Ryk E Spoor and Eric Flint

Published 14 June 2010
  • When the strange fossil she'd discovered had ended up giving her a trip to
    Mars, Helen Sutter thought she'd gone about as far as any paleontologist would
    ever go in her lifetime. But when you've also married A.J. Baker, overconfident
    super-sensor expert for the only private agency in space, the Ares Corporation,
    and your best friend Madeline Fathom Buckley is a former secret agent who's just
    signed on as the chief of security for the newly created and already embattled
    Interplanetary Research Institute of the United Nations, there's always
    somewhere farther to go. The newest discoveries will take her, A.J., and their
    friends Jackie, Joe, and Madeline to the mysterious asteroid Ceres, and beyond,
    in a desperate race to Jupiter's perilous miniature system of
    radiation-bombarded moons. The next gold rush is on for alien technology, hidden
    in lost bases around the system. And there are people willing to do anything to
    get it — even plan the first interplanetary war, four hundred million
    miles from home!
  • The sequel to Boundary.

Book 3

Portal

by Ryk E Spoor and Eric Flint

Published 21 May 2013
  • The sequel to Boundary and Threshold!
  • Madeline Fathom had miraculously landed the crippled Nebula Storm on
    Europa. She joined on that frozen moon of Jupiter the stranded crewmembers of
    the ill-fated EU vessel Odin. The Nebula Storm's reactor was
    ruined in the landing, the Odin’s shuttle can’t make the trip
    back home, and the only vessel that could have made the journey to save them has
    just been destroyed by a renegade crewman, bad luck, and the remorseless forces
    of nature. But Madeline, Helen Sutter, A.J. Baker, and the team have one card
    left to play. All they have to do... is survive lethal radiation, vacuum, and
    ice as hard as steel while they figure out how to make Nebula Storm fly
    again. But even as they prepare to make the journey home, Europa has one more
    discovery waiting for them... a discovery that might be the deadliest trap in
    the Solar System!

Book 4

Castaway Planet

by Eric Flint

Published 23 February 2015
  • New entry in Eric Flint and Ryk E Spoor's bestselling Boundary
    series! Lost in the dark, half a year into their journey to the colony world
    of Tantalus, Sakura Kimei, her family, and her best friend, the alien "Bemmie"
    nicknamed Whips, are torn from the safety of their colony ship. In a crippled
    lifeboat, they had one chance to find a habitable world. But even then, they
    would find that their apparent salvation was a world of a thousand
    secrets.

Book 5

Castaway Odyssey

by Eric Flint

Published 25 September 2016
#5 in the Boundary series universe, and sequel to Castaway Planet, by New
York Times multiple best-selling author Eric Flint and veteran science fiction
and fantasy author Ryk E. Spoor.


Castaway Resolution

by Eric Flint and Ryk E Spoor

Published 12 April 2021
IT'S NOT PARANOIA IF THEY REALLY ARE OUT TO GET YOU

The Kimei family and a second group of castaways, led by the redoubtable Sergeant Campbell, have finally joined forces, landing on the bizarre planet Lincoln, whose “continents” are actually huge floating coral colonies inhabited by even stranger lifeforms. They have survived crash-landings, venom-filled bites, disease, and even the destruction—and consumption!—of one of their floating island homes. They have learned to live, even to prosper, in this strange new place.

Meanwhile, out among the stars, Lieutenant Susan Fisher pieces together the mystery of what happened to the starship Outward Initiative and begins to believe that, just possibly, some of the survivors have escaped to a mysterious and unsuspected star system. But Fisher’s preparations and the resourcefulness of the castaways may not be enough. Because the planet Lincoln is far from done with them yet.

Praise for previous books in this series:

“[F]ast-paced sci-fi espionage thriller . . . light in tone and hard on science . . .”—Publishers Weekly on Boundary

“The whole crew from Flint and Spoor's Boundary are back. . . . Tensions run high throughout the Ceres mission . . . a fine choice for any collection.”—Publishers Weekly on Threshold

“[P]aleontology, engineering, and space flight, puzzles in linguistics, biology, physics, and evolution further the story, as well as wacky humor, academic rivalries, and even some sweet romances.”—School Library Journal on Boundary