Ruby is kind of a Carrie/possession rip off BAKA, Piper Laurie is in it and it's all to do with a Gangsters moll and her daughter.
Gangster dies and possesses the deaf/mute daughter to get revenge on the people who killed him. Cue telekinesis type deaths at a drive in.
Not amazing but worth watching, apparently there are lots of sub par dvd copies. The VCI disc i got is widescreen, a fairly decent print and has a commentary with Laurie and Harrington,interview with Harrington and trailer.
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MIKE: I've got it! Peter Cushing! We've got to drive a stake through his heart!
VYVYAN: Great! I'll get the car!
NEIL: I'll get a cushion.