Another chance to look at the evidence in the unsolved murder of Alison Shaughnessy, who was stabbed to death in her London home in 1991. Sisters Michelle and Lisa Taylor were originally jailed when diary entries revealed Michelle, a work colleague of the victim, had had an affair with Alison's husband since before he married and remained infatuated with him up to the time of the murder. Supporters who successfully campaigned to have the sisters freed on appeal reveal why they are convinced of their innocence, while relatives of the victim demand answers to one of the most perplexing cases of recent times