The police drama set in London's East End continues with the first in a two-part story. As Chandler and Miles attend the christening of Miles's daughter, a fox runs through the streets of Whitechapel with a human arm in its mouth. Later, more body parts from the same victim are washed up by the Thames, all containing evidence of a fatal poisoning. The only clue to the identity of the victim is a tattoo on the headless torso - can the team crack this gruesome case before the killer strikes again?, Part 1 of 2. Body parts wash up by the Thames; and the investigation reveals they are from the same victim, who was poisoned.