This series started out slow for me, but #4 and this one have me really hooked. I love the way the story starts--no police in sight, no crime as of yet...just a young woman waking up in a hospital with amnesia. She has no idea who she is, where she is, although she knows what things are ("this is a chair") and the general workings of things (I'm in a hospital so I must be sick). She is rather quickly discharged to the care of the Bath Social Services since her physical ailments--except the memory loss--resolve, and she is moved to a hostel for the homeless.
Meanwhile, a few chapters later, Peter Diamond, head of the murder squad, is bored and fears he's going to be seconded to a larger city's team. But suddenly, 3 probable suicides in a row--two of them interesting--have him snooping about on his colleague's patch in CID. Eventually we get back to "Rose" (the girl with amnesia) and the tie-in to the suspicious deaths, but it takes plenty of twists and turns to get there. Really enjoying this series a lot!