Unswerving. Unstoppable. Unhinged.

Angus Force is determined to hunt down the serial killer he'd once shot dead—or so he thought. An anonymous source reports that Lassiter is alive, and soon a body bearing his maniacal MO turns up. It's just the beginning of a murderous trail blazing right to Force's backyard.

Nari Zhang is the shrink for the ragtag Deep Ops unit. Once they're thrown together on the case, their attraction is explosive and irresistible. But when the killer catches a glimpse of Nari, she becomes his new obsession—the focus point, for both Force and Lassiter, in a dangerous dance for survival.