When fishermen haul a bag containing a dismembered arm from the River Avon, a search ensues to find the rest of the body.

Detective Inspector Ryan Chase of the Bristol Major Crimes Investigation Team is in charge of identifying the deceased and bringing the killer to justice.

Dealing with grief from the death of his daughter, his broken-down marriage, and a worrying habit he can't seem to break, DI Chase has his hands full.

The mystery deepens when a second limb is found, and it doesn't match the first.

Who is dumping body parts into the river? Why are clues leading DI Chase back to a ten-year-old unsolved case?

Has a murderer reignited their taste for death?