Two on a Guillotine 1965

Synopsis:

The daughter of a dead magician who accidentally killed his wife, her mother, while performing a guillotine trick must spend the night in his house in order to collect her inheritance. Is the house haunted or is it all magic?

Directed by: William Conrad
Runtime: 107 minutes
Tagline: Wouldn't you like to learn how to flip your lid? If you're chopping for entertainment, here's the super shocker of them all.
Cast:
Connie Stevens
Connie Stevens
Cassie / Melinda Duquesne 
Dean Jones
Dean Jones
Val Henderson 
Cesar Romero
Cesar Romero
John Harley 'Duke' Duquesne 
Parley Baer
Parley Baer
Jules 'Buzzy' Sheridan 
Virginia Gregg
Virginia Gregg
Dolly Bast 
Connie Gilchrist
Connie Gilchrist
Ramona Ryerdon