Green for Danger
Christianna Brand
 A murder takes place in a rural British hospital. Inspector Cockrill is tasked to determine whodunit when the head nurse is killed after revealing that the death of a patient under anaesthesia was no accident. Cockrill states at one point, "My presence lay over the hospital like a pall - I found it all tremendously enjoyable." After another murder attempt leaves a nurse dangerously ill he re-stages the operation in order to unmask the murderer. it:Delitto in bianco