The crystal blue waters of the Hundred Isles might look like paradise, but a deadly trap is waiting to close around four young heroes. Conor, Abeke, Meilin, and Rollan have been fighting to keep incredibly powerful talismans safely away from their enemies. Throughout their exhausting journey across the world, they have been constantly hounded by pursuers who always seem to know exactly where they are hiding. Now, they have finally discovered the terrible truth: one of them is a traitor. As they sail through beautiful tropical islands, the once-solid team cannot help but look at each other with deep suspicion. There is a spy hidden in their ranks, sharing their every move. Before this dangerous mission is over, they must figure out who is feeding information to the enemy before it costs them everything.