"Ten years ago, five-year-old Tommy Lange disappeared without a trace from his front yard in Oceanside, California. Now his big sister, Addison Lange, is an Agent-in-Training with the FBI. She has a particular set of skills, honed over a decade of searching for her brother, and she's about to unleash them in one final, desperate attempt to find him. But what she discovers is far more than she can handle by herself. Special Agent and profiler Nick Keegan, suffering the devastating aftermath of his encounter with serial killer Aleksandr Zorin two months earlier, is compelled to help Addie in the search for her missing brother. But Zorin isn't yet done with Nicholas Keegan. The Maelstrom awaits." -- Publisher.