In the glorious sunshine of Oxford, on a day when everyone should be celebrating, tragedy strikes when a university student is found floating in the river, dead. Probationary WPC Trudy Loveday finds herself paired with coroner Clement Ryder to investigate and it soon becomes clear that this case is not going to be easy. The witnesses all refuse to give a straight answer, each new lead sends them in a new direction and tales of other missing youngsters add further mystery to the investigation.