Another brilliant case from Sir Henry Merrivale. This time G.M. finds himself drawn into a showdown between the almost “Lupin-esque” elusive thief-murderer Flamand and Inspector Gasquet, who has been trying to arrest the criminal for several years. And so, Flamand boldly announces his intention to steal the mysterious “unicorn”, Gasquet sets up a cunning trap, and Sir Henry completes the intricate combination with an elegant blow.