Varsha (Aisha) and Jessy (Malavika Menon) are very close friends. They live together in a rented house and are working in the same IT Company. They celebrate and enjoy their life as they can. One of the rooms in their house is locked and in a particular circumstance they get a photo from the surroundings of the locked room. Varsha knows the young man in the photo. Varsha acquaints Anus Muhammed (John Jacob) during an interview. They soon realize that their rented house belongs to Anus. They decide to find out Anus. The intriguing and interesting incidents that occur in their search of Anus Muhammed form the rest of the plot of Monsoon.