The second novel featuring recovering psychotic DC Fiona Griffiths opens with as intriguing a pair of murders as you could imagine. Firstly, part of a human leg is discovered in a woman's freezer, bagged up like a joint of pork. Other similarly gruesome discoveries follow throughout a cosy Cardiff suburb, with body parts turning up in kitchens, garages and potting sheds. And while the police are still literally putting the pieces together, concluding that they all belong to a teenage girl killed some ten years earlier, parts of another body suddenly start appearing, but this time discarded carelessly around the countryside clearly very shortly after the victim - a man - was killed.

Mysteries don't come much more macabre or puzzling than this. Who were the two victims, and what connection could they have shared that would result in this bizarre double-discovery?

But that's only half the story. The most gruesome moments are much more about Fiona and her curious mental state. There is a complex and very clever double mystery here, and what makes the story unique is the parallel unraveling of Fiona's own mystery, and it's her voice, established precisely in the first book but given even freer rein here, that makes it so compelling.