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Episode 5: Police respond to a stabbing and discover that the victim has a secret identity. Having connected the serial killer to an online dating site, Forensics Officer Miller poses as a teenage girl to lure the culprit, while Dinah tries to mend her broken relationship with Cathy.

Starring: Paul Ritter, Tom Varey, Joanna Scanlan, Elaine Cassidy, Saira Choudhry.