Dr. Daniel Challis and Ellie Grimbridge stumble onto a gruesome murder scheme when Ellie’s novelty-salesman father, Harry, is killed while in possession of a strange mask made by the Silver Shamrock mask company. The company’s owner, Conal Cochran, wants to return Halloween to its darker roots using his masks — and his unspeakable scheme would unleash death and destruction across the country.

Lewis and Clark, aka The Sunshine Boys, were famous comedians during the vaudeville era, but off-stage they couldn’t stand each other and haven’t spoken in over 20 years of retirement. Willy Clark’s nephew is the producer of a TV variety show that wants to feature the reunion this classic duo. It is up to him to try to get the Sunshine Boys back together again for the show.