To Ellie and Hardy, and the rest of Broadchurch CID, it becomes clear very quickly that the location of the attack and all the surrounding circumstances are going to make this an incredibly difficult investigation.
Ellie and Hardy start to investigate Trish's life. Who are her friends and family? The men in her life? They meet her ex-husband Ian, her best friend's husband Jim, and Lucas, a local cab driver. All of them were in the area when the attack took place.
Ellie and Hardy need Trish to give her main video interview, which will be relied on in court if the case goes that far, but she is still in trauma.
They need to move the investigation forward quickly as there is a predator on the loose. Trish's ISVA tells Hardy and Ellie that she doesn't think Trish is ready, but Hardy decides they should go ahead.
But it is too soon - they do get more information, but Trish brings the interview to a premature end when they ask her a question that she is not prepared to answer.

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.