Two on a Guillotine (1965)

Synopsis
A scary old haunted house provides the setting of this spooky thriller that centers on a psycho-magician who cut off his wife's head during a performance. Twenty years pass and he finally dies. His daughter is to inherit his estate, but before she can claim it, she must spend seven nights in his mansion. A reporter decides to stay with her. It's a good thing too because her father isn't dead at all. He is hiding in the house waiting for a chance to lop off her pretty little head. ~ Sandra Brennan, All Movie Guide