The detectives unravel long-forgotten secrets and have a potential circumstantial case against two suspects, but they need more to prove their case in court - fortunately, they get a breakthrough after an appeal for new witnesses with testimony that changes everything. Can the detectives finally uncover what happened to Carol?

Detectives reinvestigate the murder of Carol Morgan in the storeroom of her Bedfordshire corner shop in 1981 - re-examining the files, revisiting the crime scene, and looking for new witnesses as previously missed evidence points to a different theory. Two new suspects are identified and brought in for questioning.