Strange Intruder

Strange Intruder is a 1956 drama film directed by Irving Rapper and starring Edmund Purdom and Ida Lupino.

Paul escapes from camp and is treated for trauma in a U.S. hospital for veterans. Having no family of his own, he visits Carmichaels and is made welcome. Alice has ended her affair with Howard Gray, but he is blackmailing her. Paul becomes consumed with his friends last request and has terrible visions of killing Carmichaels kids.After a fight with Gray, he comes to realize that a return to the VA hospital is necessary. Treated like a part of the family now, Paul believes his frightening promise to be a thing of the past. ........

Source: Wikipedia