Mission Grey House is a suspense thriller that revolves around a young boy named Kabir Rathore (Abeer Khan) who falls in love with Kiara (Puja Sharma) whose father is an IG. Kabir aspires to become a police officer and fulfills his dream by wearing the police uniform and fighting the goons alone. Knowing this Kiara’s father meets Kabir and warns him about the consequences. On Kiara's recommendation, her father assigns Kabir a mission to solve the Grey House mystery where a series of murders are taking place. Kabir accepts the challenge and goes to Grey House and gets trapped there. How he comes out of this? And how he finds the killer forms the remaining part of the story.