The Girl in Room 105 by Chetan Bhagat is a fast-paced mystery thriller with elements of romance and social commentary set in contemporary India. The story follows Keshav Rajpurohit, an IIT graduate working as a coaching class tutor who is still holding on to his past love for Zara Lone, his ex-girlfriend from college. On Zara’s birthday, he receives a surprise message from her asking him to visit her in Room 105 of her hostel — but when he sneaks in, he finds her murdered and becomes determined to uncover the truth behind her death. What begins as a personal quest for justice turns into a gripping investigation involving suspects, red herrings, and shocking twists as Keshav, with the help of his friend, digs deeper into the case. Alongside the suspense, the novel touches on cultural tensions, heartbreak, and the struggle to move on from lost love while keeping readers guessing until the end.