A London detective constable hunts down a bloodthirsty woman—while also harboring dark suspicions about one of her fellow cops . . . Since committing her first murder a month ago, Cara Mooney craves the high it gave her. She decides it's time to kill again—and Ryan has no idea he's meant to be her next victim. Meanwhile, after being suspended from her job, DC Nasreen Maqsood returns to work and quickly suspects that DCS Adams might be a dirty cop. She vows to investigate, but knows she must tread carefully. Then she's handed the case of Ryan's murder. With the pressure mounting, Nasreen finds her hands full. Soon it becomes apparent that Nasreen is looking for a sadistic predator, but little does she know just how determined this killer is . . .