Jed Walker is the man you want watching your back.

A sinister group - code-named Zodiac - has launched devastating global attacks. Twelve targets across the world, 12 code-named missions. Operating distinct sleeper cells, they are the ultimate terrorist organisation, watching and waiting for a precise attack to activate the next group. It is a frightening and deadly efficient way to stay one step ahead. And cause the most chaos.

For ex-CIA operative Jed Walker, chaos is his profession. On the outer, burned by his former agency, he is determined to clear his name. Stopping Zodiac is the only way. Desperate to catch the killers and find the mastermind, he can't afford to lose the next lead, but that means that sometimes the terrorists have to win. Ultimately it all comes down to Walker: he's the only one who can break the chain and put the group to sleep...permanently. It's exactly 81 hours until deadline.

James Phelan is the best-selling and award-winning author of 28 novels and one work of nonfiction. From his teens he wanted to be a novelist but first tried his hand at a real job, studying and working in architecture before turning to English literature, spending five years at a newspaper and obtaining an MA and a PhD in literature. For Hachette Australia, James has written five titles in the Lachlan Fox thriller series and the Alone trilogy of young adult postapocalyptic novels.

The ex-CIA character of Jed Walker was first introduced in The Spy, which was followed by The Hunted, Kill Switch and Dark Heart. James has also written a 14-book adventure series for Scholastic, titled The Last Thirteen. He has been a full-time novelist since the age of 25 and spends his time writing thrilling stories and travelling the world to talk about them.