Call him "Mr. Mystery," "Mystery Guy," "The amazing star of Cabaret" or whatever moniker suits you — but there is no defining Masterpiece mystery!'s eclectic and talented host Alan Cumming. In an exclusive backstage video interview, the multi-talented Scot talks about being recognized by Masterpiece mystery! fans, his recent run at Lincoln Center in a one-man cabaret show, his upcoming, star-packed film The Tempest, mystery maven Agatha Christie and his mother-in-law's infatuation with his hair.