These 3 paperbacks have been added to the series after the original monthly series was written. So if you have read the first series these books are next.

Includes: Missing, Hunted, Endgame in a box set

Ryan has disappeared, and Cal's suspicions are raised when he receives a cryptic message: 90 days. Cal agrees to work as an undercover agent to find his twin. But at an island getaway for troubled teens, Cal quickly discovers secret hideouts, underground training camps, disappearing campers, mysterious clues and treacherous terrain. As the series progresses, the fate of his brother and the lives of millions are in Cal's hands. Will he save Ryan and stop the evil plot in time? Or will this secret mission be his last? The clock is ticking. Any second could be his last. Callum Ormond has been warned. He has 90 days. The countdown begins …