Book Four of the Jake and Polly series A festive Caribbean Cruise quickly turns into a nightmare of haunted visions, mystifying behaviors, and horrific events . A mysterious young woman is the center of secrets and suspicions as Polly and Jake seek to answer questions of who she is and what she is hiding. Uncovering a deep secret exposes them to a danger they never imagined. Who lurks in the darkness and what is the shadow they see? The answers surprise even Jake and Polly. A terrorizing tale filled with adventure, mystery, murder and romance. A teen novel.