DI Helen Grace returns in Pop Goes the Weasel, the electrifying new thriller from M. J. Arlidge.

The body of a middle-aged man is discovered in Southampton's red-light district - horrifically mutilated, with his heart removed.

Hours later - and barely cold - the heart arrives with his wife and children by courier.

A pattern emerges when another male victim is found dead and eviscerated, his heart delivered soon afterwards.

The media call it Jack the Ripper in reverse; revenge against the men who lead sordid double lives visiting prostitutes. For Grace, only one thing is certain: there's a vicious serial-killer at large who must be halted at all costs . . .