Watching the Dark (Inspector Banks, #20)

DCI Alan Banks reluctantly investigates DI Bill Quinn with Inspector Joanna Passero. Quinn, convalescing at St Peter’s Police Treatment Centre, was killed by a crossbow on the tranquil grounds, and left compromising photos. Quinn may be disreputable, linked to a vicious crime in Yorkshire and to a cold case – English Rachel Hewitt 19 vanished in Estonia six years ago.