In the suspenseful film, a wealthy patriarch's relatives eagerly await his passing to claim his inheritance. However, he leaves a surprising stipulation: his will won't be read for 20 years. When the appointed day arrives, his expectant heirs gather at his eerie mansion, only to discover that the inheritance goes to the only heir with his name - Annabelle - if she's deemed sane. If not, the fortune and diamonds will go to a mysterious successor whose identity remains hidden in a sealed envelope. As the lawyer's disappearance sets off a series of bizarre events, doubts arise about Annabelle's mental state, leaving the audience questioning who will ultimately claim the inheritance.

The Cat and the Canary
A group of eccentric relatives converge on a foreboding mansion to uncover the terms of a deceased millionaire's will, leading to a tangled web of family secrets and surprises.