Answer
"This Gun for Hire" (1942) stars Alan Ladd as Philip Raven, a cold-blooded hitman hired to kill a wealthy businessman. The film follows Raven as he executes his assignment with ruthless efficiency, but his plans are complicated when he falls for the businessman's secretary, Ellen Graham (Veronica Lake). The film's noirish atmosphere, suspenseful plot, and iconic performances from Ladd and Lake have made it a classic of the genre.