Mystery In Dracula's Castle(1973)
Marsha Booth takes her two children, Alfie and Leonard, on vacation to a small seaside town in California. She picks a quiet community, hoping to finish a novel she's working on, but the boys are not very happy. The town is too quiet for them and they're quickly bored, until Alfie decides to make his own horror movie. This brings them into contact with two jewel thieves who are hiding nearby.