The House in Nightmare Park

The House in Nightmare Park known as Crazy House in the U.S. is a 1973 British comedy horror film directed by Peter Sykes and starring Frankie Howerd, Ray Milland and Hugh Burden. It was one of a number of British comedy films which parodied the successful British horror genre, closely associated with the Hammer Horror films. Its plot follows that of a traditional Old Dark House story.

After they send him to bed, Stewart and Jessica talk cryptically about not being able to find something in his luggage and concluding he must have it elsewhere. Later on Twelvetrees is chided by Stewart for nearly walking in on a restricted room Stewart explains his ill brother Victor is in there. Then during his sleep Twelvetrees is woken to a commotion downstairs Stewarts other brother Reggie Hugh Burden and his daughter Verity Elizabeth MacLennan have arrived with Reggie demanding his regular allowance from Victor. Spying on the proceedings Twelvetrees spots Stewart going elsewhere to see his mother. The next day, after being introduced to a snake house underground, Twelvetrees secretly goes upstairs to see Stewarts mother though kept behind a locked door she initially seems extremely polite and explains her familys history of theatrics in India. Suddenly, she tries to kill Twelvetrees with a knife but he is saved by Patel the servant explains her presence there is secret lest she be taken away. Though very unnerved, Stewart persuades Twelvetrees to stay to perform that evening.Before doing so another brother arrives Ernest Kenneth Griffith and his wife Aggie arrive to demand his regular allowance both he and Reggie have found their cheques from Victor have been bouncing. Suspicious that Stewart is trying to change Victors will to his favour, Reggie and Ernest resolve to stay and make sure that doesnt happen. In the meantime, Verity persuades Twelvetrees to check up on Victor, and to their shock discover the bed in his room is filled by a dummy. Confronted, Stewart tells Reggie and Ernest that Victor is dead and reveals another secret Twelvetrees is in fact Victors secret son and that he is entitled to everything in Victors will. Plus, Stewart is convinced Twelvetrees unknowingly has a clue to where a batch of diamonds are hidden on the estate. Ernest and Aggie, after their own search, are convinced theyve found the clue is a framed misquoted motto and plan t

Source: Wikipedia