Award-winning journalist Mark Williams-Thomas re-investigates the mysterious disappearance of Bournemouth wife and mother Carole Packman. Her husband Russell is in jail for her murder but Carole's body has never been found. In this four-part series, Mark wants to investigate further the relationship between Russell and his mistress Patricia. He tracks down one of her old boyfriends and hears his account of how Russell and Patricia behaved after Carole's disappearance. Mark discovers that five years after Carole disappeared, someone claiming to be Carole signed over her share of the family home to Patricia. Mark enlists the help of a handwriting expert to help find answers. Mark uncovers a series of letters in which Sam's father speaks for the first time about what happened in 1985 - but is he telling the truth? With the help of forensic experts, Mark sets about testing the theories of what could have happened to Carole Packman.