Nine months ago DCI Matilda Darke survived a bullet to the head. The brutal attack claimed dozens of lives, including those she loved most, and the nightmares still plague her every waking thought. Now, she's ready to get back on the job. But a new terror awaits. A woman is found murdered and her wounds look eerily similar to several cold cases. Desperate to find a lead, DCI Darke and her team must face a terrifying truth: a serial killer is on the loose in Sheffield. Matilda has led countless murder investigations before but the lingering emotional scars from her ordeal and the uneasiness within her once-tight team have left tensions high. As the body count rises, Matilda realises that this might just be where it all ends.