Nest of Vipers (Mrs. Bradley Series 55)

A young man who is superintendent of a public swimming pool is unexpectedly left a fortune and a huge, neglected house. Influenced by his ex-fiancee, who looks after his business arrangements, he allows the mansion to be turned into flats to let. When Miss Minnie is found dead in her bed, the murder is followed by the arrest of the young landlord and then another murder. Dame Beatrice Lestrange Bradley sets out to discover how many murderers there are and works tirelessly to solve these mysteries.