The Man with the Black Cord by Auguste Groner - Audiobook

The Man with the Black Cord by Auguste Groner. (Translated by Grace Isabel Colbron.)
Read by J. M. Smallheer.
A baffling disappearance. A bedroom door locked from the inside. A housekeeper with something to hide. Will retired policeman turned private detective, Joseph Muller, be able to sort out the clues and solve this locked room mystery? Summary by J. M. Smallheer