Danger Signal (1945)

Smooth-talker Ronnie Mason earns his living by murdering lonely women for their inheritances. On the run, Ronnie poses as a disabled war vet and takes a room at the Fenchurch home. He at first courts elder daughter Hilda, but changes his plans after meeting her younger, prettier--and richer--sister. Hilda discovers Ronnie's scheme, but can she act before her sister becomes his next victim?