Missing

"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 for SI-6 to discover the whereabouts of his twin. But at an island getaway for troubled teens, Cal quickly discovers things are not as they seem. With secret hide-outs, underground training camps, dangerous clues and treacherous terrain, Cal has to face his most heart-stopping challenges yet. Will he find Ryan? Or will his first secret mission be deadly? The clock is ticking. Any second could be his last"--P. [4] of cover.