Reputations: A Madeleine Porter mystery

Madeleine Porter is enjoying a luxury holiday cruising down the Nile when she meets fellow holidaymaker Margaret Smith. Inevitably, the conversation turns to family history and Margaret says that she knows very little about her late husband's background. Madeleine offers to help but Margaret is determined to do it for herself, but says she will keep Madeleine informed. A few weeks after they return from the holiday, Madeleine and Ian are shocked to hear of the murder of their new friend in her own home. Struggling to come to terms with this, the following day they receive a package from Margaret, which includes an old newspaper cutting giving details of the murder of an elderly couple in 1966. Margaret has scrawled on the cutting 'Peter didn't do this'.

What is the connection between the two events, or isn't there one? Why was Margaret so sure about her husband and was she right? Madeleine and Ian are asked by Bernard Livesey, a friend of Margaret's, to continue her work into Margaret's husband's background, but in doing so, will her own reputation be compromised? Her friend, Peter Duffy, now promoted to Chief Inspector, is striving unsuccessfully to solve his first case since his promotion, but he realises he needs Madeleine's skills to untangle the web of complex family relationships, which is the key to the case.