Crescendo (1970)

Stefanie Powers stars as a graduate student who travels to the home of a recently deceased composer to study his work. In addition to his widow, his son (James Olsen) lives in the house. He was a tennis player who has been bound to a wheelchair due to an accident. Powers discovers she bears a striking resemblance to his girlfriend who left him after the accident. She falls for him, but things are not exactly what they seem to be. One of the last psycho-thrillers made by Hammer. The cast is good, with Joss Ackland also appearing as a household servant. The film really drags during the laborious set up, but it has a satisfying and somewhat surprising climax.