Let's Kill Uncle

Let's Kill Uncle is a 1966 color horror film directed by William Castle about a young boy who is trapped on an island by his uncle who is planning to kill him. His only friend is a young girl who tries to help him. It stars Nigel Green, Mary Badham, Pat Cardi and Robert Pickering. It is based on a novel written by Rohan O'Grady. It was filmed in Bermuda.