And So Died Riabouchinska

S1 E20: A detective investigates the death of a man found in the basement of a vaudeville theatre. After some questioning, he determines that the headliner, a ventriloquist named Fabian (Claude Rains) may have been visited by the murdered man just before his death. As he probes further, the detective soon discovers that this murder may have something to do with Fabian's odd mental state and his curious devotion to a particularly beautiful marionette that he uses in his act.