Michael Fassbender has not appeared in a film since 2019, and his return to the screen in David Fincher's The Killer is just the kind of nuanced performance the actor needed at this time in his career. However, the film in which his slick performance resides contains a script too simplistic to properly engage. The characters are never fully developed, feeling like caricatures. This causes the stakes to be significantly lowered because the audience is not connected to anything occurring in the film. However, a solid lead performance and stylish filmmaking push The Killer's watchability.