Now living in a houseboat on the River Thames, Lacey Flint is becoming a part of London's weird and wonderful riverboat community. But at dawn one hot summer morning, Lacey finds the body of a shrouded young woman in the river. She assumes it was chance--after all she's recently joined the marine policing unit--but further investigation leads her team to suspect it was deliberately left for her to find. She is no longer a detective, but as she begins to suspect someone is watching her very closely, she can't help but be drawn into the investigation.