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.