Cheap and cheerful AIP entry in the 'Is she going mad?' school of horror/thrillers.

A release date of January 1958 seems unlikely as Ernest Gold was still scoring the thing in May and James Nicholson showing it to friends in June.
So I'm going with 08/24/1958 when it played in Las Cruces, NM.

Double billed with Terror From the Year 5,000 in the US
and Cage of Doom in the UK.