S3·E1 Out of Mind

Chappel's former boss Frank Vickers is found lurking in the basement during a raid on a Soho brothel, and the team learn that Chappel has a more-than-shady past involving former prostitute Jane Farrell, with whom he fell in love. Vickers is determined to clear his name, and Chappel's life looks set to be blown apart when Vickers reveals some very sordid secrets to his colleagues in Vice.

Chappel goes in search of Jane, and discovers that one of her friends, whom he was friendly with, disappeared some years previously and has never been found. When Chappel finds the body in the basement of the brothel, he becomes determined to prove Vickers' involvement in her death.