13 Ghosts (1960)

When the reclusive Dr. Zorba dies, he leaves his sprawling mansion to his nephew Cyrus and Cyrus’s family. The inheritance seems to promise hidden wealth, but finding the doctor’s fortune means searching a house filled with more than old rooms and secrets. Along with the property, the family has inherited the occultist’s eerie collection of ghosts, twelve spirits who appear to be waiting for a thirteenth.