The Ruth Rendell Mysteries

A lonely divorcee becomes involved with a neighbor (Owen Teale, "Game of Thrones") whose wife and her lover carried out a suicide pact.

Susan (Amanda Redman) does some sleuthing into Bob's past and finds murderous connections between him and Magdelene.

After four attractive women are found strangled in and around the local river, the free-spirited wife of a London doctor is killed while on an extramarital assignation.

The investigation leads to Eddie Brannel, a childhood friend of Sara's, and although he admits to other killings he denies killing her.