A severed hand is sent to the police station and investigations link it to the murders of several women around the country,all of whom had used the Crescent Moon dating agency. After Alex has unsuccessfully carried out an experiment in speed dating, Shaz,disillusioned with her job and seeking a challenge,goes undercover to trap the killer.

Cast: Philip Glenister, Keeley Hawes, Dean Andrews, Marshall Lancaster, Montserrat Lombard, Daniel Mays, Joseph Long, Geff Francis, Beth Goddard, Nicholas Sidi, Nick Haverson, Dean Nolan, Rupert Simonian, Charlie Roe, Flaminia Cinque