1960s American International (?) horror movie

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Back in the late 1960s I saw a movie on television which I think was originally made in Italy for the American market, possibly by American International. A group of young people decide to investigate a supposed haunted house or castle. Once inside, they find a book of spells which indicates that crosses and stars of David confer protection from evil supernatural forces. Some of the young people then cast a spell, not expecting anything to happen. Unfortunately, they summon a demon and become possessed. There is conflict between them and their friends. The movie ends with the last of the "good" guys -- a man -- being killed with a stiletto or hypodermic needle by a passing stewardess -- one of the possessed girls -- in a crowded airport. She smiles as she walks away.

Thanks in advance.



Wow; I am impressed that you know such an obscure movie. Unfortunately, it isn't the one I am looking for. Thanks all the same.