It is no ordinary murder case that brings the famed French detective Monsieur Bencolin out of retirement, but one that involves a midnight rendezvous on a steamy Paris night, a broken love affair, and four different murder weapons found in the secret villa where the body is discovered.

Rose Klonec, whose corpse bears the mark of a particularly horrible wound, had connections - and old lovers - throughout Paris, and soon the number of suspects grows to match the number of possible weapons ...