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15th book in the Conspiracy 365 Series. Ryan has disappeared, and Cal's suspicions 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.
Used availability for Gabrielle Lord's Missing
June 2014 : USA Hardback