The Secret Friend (Unabridged‪)‬

When Harvard student Emma Hale disappears, her father believes she has been kidnapped. Months pass and the trail goes cold but then her body is found floating in Boston Harbour. A year later, Judith Chen, another student, disappears. Like Emma, she is soon found dead in the river.

CSI Darby McCormick is assigned to the case and uncovers a key piece of overlooked evidence, one that brings her into contact with Malcolm Fletcher ...a former profiler, now on the FBI's Most Wanted list. Fletcher, it seems, not only knows the answers but also the identity of the killer. When a third student goes missing, Darby is led into a dangerous game of cat-and-mouse with the former profiler...