The Door / Mary Roberts Rinehart

A wealthy landlady discovers how little we know about the people closest to us.What is the world coming to? That is what goes through Elizabeth Bell’s mind on the night of 18 April. Sarah Gittings, the family nurse, had just been brutally murdered. But all thoughts of a murderous spree killer were dispelled when it turned out that Sarah had known and trusted her killer.

Who could possibly have anything against good old Sarah? As Elizabeth was soon to find out, there was more than one suspect with a motive in her sober and orderly household … and, before all was said and done, more than one victim.