First broadcast 6th October 2014.

The team notice that DNA from teen-aged market trader Spencer Rogers, arrested for throwing a brick on the motorway, matches that of interpreter and chess club member Agnes Bradley, murdered in 2010 and when Spencer's mother Kelli tells Sasha that Spencer was the result of her being raped by an unknown man it is apparent the rapist is the murderer.

Denis Lawson ... Steve McAndrew
Nicholas Lyndhurst ... Danny Griffin
Tamzin Outhwaite ... DCI Sasha Miller
Dennis Waterman ... Gerry Standing
Anthony Calf ... DAC Robert Strickland
Julie Graham ... Tricia McAndrew
Mariah Gale ... Kelli Rogers
Finlay Robertson ... Jeremy Powell
Nicholas Woodeson ... Viktor Proust
Leanne Best ... Zoe Baines
Anthony Barclay ... Carlos Alvarez
Ian Hogg ... Robbie McAndrew
Fox Jackson-Keen ... Spencer Rogers
Gertrude Thoma ... Agnes Bradley
Attila G. Kerekes ... Chess Player
Susannah Todd ... Care Home Nurse