Jagga Jasoos is a musical adventure of a detective teenager who along with a female companion, is on a mission to find his missing father. Jagga (Ranbir Kapoor) is orphaned at birth and grows up in a hospital. He develops a bond with a patient, Badol Bagchi (Saswata Chatterjee), who adopts him. Jagga stammers and Bagchi teaches him that he can be fluent if he sings instead of talking. In a mysterious turn of events, Bagchi admits Jagga in a boarding school and leaves for an important mission under Kishan Sinha (Saurabh Shukla). Jagga develops a detective bent of mind and starts solving small cases in an around his school. During one such case, he comes across Shruti Sengupta (Katrina Kaif) and both become good friends. When Jagga learns that his father is no more, he decides to find out the truth and asks Shruti to help. Whether Jagga is able to put all his grey cells to use in order to expose the wrongdoers is what forms the rest of the film.