9780786283873 | Large print edition (Thorndike Pr, February 22, 2006), cover price $28.95

9780525949022 | E P Dutton, September 8, 2005, cover price $24.95 | About this edition: Framed and dispossessed for a crime he did not commit during his first assignment, recent Spy School graduate Ben Locke learns that several of his fellow classmates have been murdered, a situation that forces him to search for the enigmatic Contact Zero, a mythical helper of Agency ex-members.

9780451412256 | Reprint edition (Onyx Books, October 3, 2006), cover price $7.99 | About this edition: Framed and dispossessed for a crime he did not commit during his first assignment, a recent Spy School graduate learns that several of his fellow classmates have been murdered, a situation that forces him to search for the enigmatic Contact Zero, a mythical helper of Agency ex-members.

9780525947943 | E P Dutton, August 19, 2004, cover price $23.95 | About this edition: Two operatives and long-time friends are transformed into enemies when they receive their final mission before retiring--the assassination of each other--embarking on an international chase as they investigate why their bosses want them dead.

9780451411945 | Reprint edition (Onyx Books, September 6, 2005), cover price $7.99 | About this edition: Two operatives and long-time friends are transformed into enemies when they receive their final mission before retiring, the assassination of each other, embarking on an international chase as they investigate why their bosses want them dead.

9780340831649 | Hodder & Stoughton, May 23, 2005, cover price $12.35 | About this edition: Meet Charlie.

9780091853280 | Ebury Pr, January 1, 1997, cover price $17.95 | About this edition: Written by the originators of the ITV series, this book includes sections on animal rescuers, true-life pet dramas, pet "professionals", star pets, pets with special talents and a behind-the scenes look at the filming of the series.