A technician ready to install a broadband was waiting outside a cottage when the cleaning woman turned up and they got together inside. They went upstairs and they were stunned in seeing the owners stabbed dead in their bedroom. Detectives soon realize that the murder isn't related to burglary, because nothing was stolen (neither cash nor jewelry). The victims didn't have enemies in their personal life (apart from a former business partner, but he was in Stoke at the time), but they had just bought the house from a banker who set many investors up in a scam. Soon after they have proofs the banker's ex-husband killed these people without having any connections to them: he suffers from amnesia and that night he was drunk, forgetting everything he had done as a result. Anyway police and lawyers have to find out the real motive.
The banker is a real piece of work: she framed people, mistreat her supportive husband and used to cheat on him with colleagues. Furthermore, she took a convenient deal from divorce papers. I feel pity for victims' daughter (Cara Horgan), who lost her beloved parents whose guilt was to be in the wrong place at the wrong time.