Black Coffee by Charles Osborne, Agatha Christie

Hercule Poirot has been summoned by inventor Sir Claude Amory. Amory has an invention that could change the world but he is afraid that there is something shady going on in his household. And then he discovers that the formula has been stolen so he locks the doors and traps everyone in one room. The lights are turned off for one minute so that the formula may be returned but when the lights come on, Sir Amory is dead. A tangled family story, this book definitely has tones of Christie and is a fun story but there are phrases that are repeated three or four times that sort of took me out of the story.

Four stars

Originally published as a play, adapted 1998

Follows The Underdog and Other Stories

Followed by Peril in End House

Borrowed as ebook from Libby

Opinions are my own