RAUTU KA RAAZ is the story of a cop investigating a murder. Deepak Negi (Nawazuddin Siddiqui) is an inspector in a sleepy town with a tragic past. One day, he is informed that Sangeeta Devi (Narayani Shastri), a warden in a blind school in Rautu Ki Beli, has passed away. His juniors – Naresh Dimri (Rajesh Kumar), Dinesh Pant (Vicky Dutt), Lata (Samridhi Chandola) and Tripathi (Anoop Trivedi) – casually investigate and conclude that Sangeeta died naturally. But Deepak gets suspicious and asks for a post-mortem. The post-mortem report confirms that Sangeeta’s death is unnatural. Thus begins the investigation. Deepak and his team grill the principal Vishwanath Kumai (Kailash Kandwal), assistant warden Hema (Preeti Sood) and trustee Manoj Keshri (Atul Tiwari). A lot of unexpected and shocking aspects come to the fore not just about Sangeeta but also about possible motives to murder her.