In the shadows of the city, Detective Mike and his partner, Detective Lyn, find themselves thrust into a terrifying investigation when a prostitute mysteriously vanishes. As they delve into the case, they uncover a series of identical murders that point to a wicked force at play. Their pursuit leads them to a macabre discovery, a killer wielding a staple gun, leaving a gruesome signature by cutting victims and then stitching their wounds with staple wires. The city is gripped with fear as the Staple Gun Killer continues to haunt the shadows.