Hollow Triumph

Hollow Triumph Reissued as The Scar is a 1948 American film noir directed by Steve Sekely and starring Paul Henreid and Joan Bennett. It was released by EagleLion Films, based on the 1946 novel of the same title written by Murray Forbes.

A chance encounter with dentist Dr. Swangron John Qualen reveals that Muller looks exactly like a psychoanalyst who works in the same building, Dr. Bartok, the only difference being a large scar on the left side of the doctors face. Seizing the opportunity, he begins researching Bartok, even slipping into his office to examine his records. He is discovered by the doctors secretary, Evelyn Hahn Joan Bennett. She mistakes him for her employer and kisses him, but quickly realizes he is someone else. He persuades her to go out with him, though she has become embittered and claims to have given up any dreams of finding love.Muller sets out to impersonate Bartok, aided by the fact he studied psychoanalysis in medical school before dropping out. He takes a photograph of the doctor and uses it as a guide to cut an identical scar on his own face. Unfortunately, the developers of the photograph reversed the negative, so now Muller has the scar on the wrong side. He discovers the mistake only after he has already murdered Bartok and is preparing to dump the body in the river. He has no choice but to go through with the plan anyway. Luckily, no one except the office cleaning lady, whose suspicions he manages to lull notices the difference, not even Evelyn or Bartoks patients. ........

Source: Wikipedia