400 Days Book by Chetan Bhagat

In Chetan Bhagat's novel 400 Days, Keshav Rajpurohit, a reluctant detective, is asked by Alia Arora to find her missing daughter, Siya, who vanished nine months prior, a case the police have dismissed as a cold case. The story combines mystery, romance, and family drama as Keshav delves into the investigation, facing societal pressures and complicated relationships while trying to solve the case before it's too late. The narrative focuses on a mother's determination to find her child, human relationships, and the blurring lines between personal and professional boundaries.