400 Days

400 Days – is a 2021 mystery and romance novel by Indian author Chetan Bhagat, the third book in his popular Keshav-Saurabh detective series. The story follows detective Keshav Rajpurohit and his friend Saurabh as they investigate the mysterious kidnapping of a 12-year-old girl, Siya, which has gone unsolved for nine months. The novel is set in modern-day Gurugram and revolves around Keshav, a private detective who is struggling to meet his parents’ expectations of him becoming an IPS officer and getting married. He is approached by his neighbor, Alia Arora, a former model and mother of two, whose elder daughter, Siya, has been missing for over nine months, a case the police have long considered cold.