true mystery

A Locked-Room Mystery | Futility Closet

this is suppose to be true, as is this one:

On the 16th of May 1937, Laetitia Toureaux was found stabbed to death in an otherwise empty 1st class compartment of the Paris Metro. The subway train had left the terminus, Porte de Charenton, at 6:27 p.m. and had arrived at the next station, Porte Dorée, at 6:28 p.m. Witnesses at both stations swore nobody was seen getting in or out of the compartment, and witnesses in both adjacent compartments swore that nobody had tried to enter the one where Mlle. Toureaux's body was found. The murderer had one minute and twenty seconds at his disposal. Neither the murderer nor the method of his escape was ever discovered.[5