The most glamorous hotel in Europe is not immune to murder...

Classic crime from one of the greats of the Detection Club

When Julian Marks, a well-known diamond merchant, is found murdered at the Hotel Fantastique in Monte Carlo, the motive is presumed to be theft. Marks always carried with him an enormous diamond on a steel chain.

Guests have noticed a shady character in button boots staying at the hotel. But when the diamond is found in an unexpected place, French sleuth M Dupuy has to rethink his investigation. Could the mystery man now lead him to the culprit?