As a bonus for Sunday Sitdown fans, we’re sharing the trailer for The Man in the Black Mask, an all-new original podcast series from Dateline and Keith Morrison.     It’s the story of a rising young director shooting a frightening film about a serial killer in a hockey mask. But when a man goes missing near the set, a real-life horror story unfolds…     If you like what you hear, just search The Man in the Black Mask to listen to the first two episodes now, completely free. Or, subscribe to Dateline Premium on Apple Podcasts, Spotify or DatelinePremium.com. Subscribers get early access to new episodes and can listen to all Dateline podcasts ad-free.