Trish returns to the scene of the crime - will she remember anything more about the attack?
DC Katie Harford discovers a strong lead - a new suspect who doesn't have an alibi.
Questioned by Ellie and Hardy, Cath reveals interesting new information about the night of her party.
Finally, a breakthrough - Hardy and Ellie get a match on the male DNA found on Trish.
An unknown woman walks into the police station. Interviewed by Ellie and Hardy, she delivers some devastating new information.