The narrative follows Jagga, a shy orphan boy with a severe stutter who discovers a profound workaround for his speech impediment: he can sing his thoughts fluently instead of speaking them. Raised in a secluded Indian town by his adoptive father, Amit, Jagga lives a sheltered yet curious existence. Amit is a man of mystery, marked by physical scars and a penchant for sudden, clandestine disappearances. He abruptly abandons Jagga at a boarding school, leaving behind only a VHS tape on each birthday and a singular rule: never trust anyone.Years later, an adult Jagga works as an amateur detective at his school, using his sharp intellect and musical outbursts to solve local mysteries. His solitary life changes when he crosses paths with Shruti Sengupta, a clumsy, ambitious
freelance journalist constantly fired from assignments for her sensationalist reporting. Shruti accidentally involves Jagga in a dangerous international conspiracy involving arms smuggling and
political assassination after she witnesses the murder of an undercover agent.When Amit fails to send his annual birthday video, Jagga fears the worst. Realizing his adoptive father is in mortal danger, Jagga convinces a reluctant Shruti to accompany him on a chaotic, globe-trotting expedition from Kolkata to South Africa. Motivated by filial devotion and the desperate need for answers, Jagga tracks Amit’s trail of breadcrumbs, which are concealed inside his past birthday tapes.Along the way, the duo discovers that Amit was investigating the 'Basuree' incident—a devastating train crash and toxic gas leak that orphaned Jagga. Amit had infiltrated a syndicate run by an international arms dealer known as 'The Boss' and a corrupt local warlord. As the antagonists realize they are being hunted, they dispatch relentless mercenaries to eliminate Jagga and Shruti. The journey tests the pair’s resilience through narrow escapes, emotional revelations, and growing romance.Eventually, Jagga and Shruti infiltrate the syndicate's headquarters in Africa. Jagga finally confronts the shocking truth: Amit faked his death and went into deep hiding to protect Jagga from the syndicate, but was ultimately captured. In a climactic, action-packed rescue operation, Jagga uses his brilliant deductive skills and sheer resourcefulness to outsmart the heavily armed guards and free his father. The film concludes with the reunited family and Shruti defeating the criminal empire, ensuring justice for the past. Jagga finally finds peace, embracing his identity not as a broken orphan, but as a fearless detective and a beloved son, ready to face whatever mysteries tomorrow might bring.