Life for the residents and servants of Hexam Place appears placid and orderly on the outside: drivers take their employers to and from work, dogs are walked, flowers are planted in gardens, and Christmas candles lit uniformly in windows. But beneath this tranquil veneer, the upstairs-downstairs relationships are set to combust.

Henry, the handsome valet to Lord Studley, is sleeping with both the Lord’s wife and his university-age daughter. Montserrat, the Still family’s lazy au pair, assists Mrs. Still in keeping secret her illicit affair with a television actor—in exchange for pocket cash. June, the haughty housekeeper to a princess of dubious origin, tries to enlist her fellow house-helpers into a “society” to address complaints about their employers. Meanwhile, Dex, the disturbed gardener to several families on the block, thinks a voice on his cell phone is giving him godlike instructions—commands that could imperil the lives of all those in Hexam Place.

The St. Zita Society is Ruth Rendell at her brilliant best—a deeply observed and suspenseful novel of murder in the quintessentially London world of servants and their masters.