Notes

Cal is undercover on Shadow Island, investigating the secrets hidden beneath the surface of this tropical paradise. Evading search parties, planning rescue missions and sneaking through a maze of hidden tunnels is now an average day for Cal. Trapped in the office of the suspicious director, how can Cal evade capture and continue his double-act with his twin brother, Ryan. As dangers multiply at every turn, at least he knows he can count on SI6 - or can he? The clock is ticking. Any second could be his last.