Three young men — Denny Kokken, Priyalal, and Shibu Majeed have been friends since college. Together, they work till they hit their 30s and start their own business that they can enjoy in a semi-retired manner. They get together and invest all their money in a resort in Kerala. However, their happy beginning is thwarted by paranormal activities and they approach John Don Bosco, a psychic who works as a mentalist in cruise ships and entertainment industry. John Don Bosco also assists the police as a human lie detector with his cold reading techniques. John informs the three hoteliers that their resort is haunted by a ghost who is seeking answers as to who killed her, why was she killed and what did they gain from her death. Through his investigations John reveals that the ghost is of Clara who was a bright and intelligent student from National Law College. Amrita was jealous of Clara's popularity and the fondness of her father towards Clara. Amrita secretly films Clara's nude scenes while bathing and leaks it online. Unable to bear the shame, Clara commits suicide. John brings justice to Clara by answering her questions. He asks Amrita to see Clara by touching his hand. She falls down in shock, cringing away from the ghost glaring at her. This proves her guilt beyond any doubts.
In 2000, Ranjith Sankar wrote the script for the TV serial, Nizhalukal, "probably the first horror serial" to premiere on Malayalam television. Citing it as an inspiration for the film, he said, " have thought of umpteen subjects to explore the genre in movies all these years before arriving on this. Pretham is a horror comedy," on his Facebook profile. Jayasurya played a Mentalist named John Don Bosco alongside Shruthi Ramachandran and Pearle Maaney. Initially Mamta Mohandas was considered for the lead role but didn't materialize. Justin Jose, known for his work in the Telugu film and the Bollywood filmBajrangi Bhaijaan, did the sound design. The filming began on 24 May 2016 in the small town in Cherai in Ernakulam.
There was over 30% hike in collection from day 1 to day 2 at the Kerala box office. The film grossed 2.67 crore in 3 days run. It remained in more than 80 screens in Kerala in its third week. The film grossed 12.45 crore in 23 days at the Kerala box office. The film collected $2,804 from UK box office. The film collected from USA box office in its third weekend. The film was commercial success.
