GRIM JIM is a story-driven horror themed multiplayer survival modification of the successful Half Life 2, in which players enter the roles of a group of talented thieves tasked with stealing a valuable object for an anonymous client. Unbeknownst to them, the long-abandoned office building that is their target has since been transformed to fit the demented mind of Jim; an ex-employee who was fired due to a psychological breakdown after being the subject of constant ridicule for his strange obsessions. Shortly thereafter, all of the employees - and Jim - disappeared. The office was soon closed down after a fruitless investigation, and the story of Jim became known only as an urban legend; a mass murderer and demented soul who hides in the shadows of his old workplace, waiting for his next victims. He is known only, as Grim Jim.