Diya Aur Baati Hum is the story of Sandhya as she trains as an Indian Police Service officer.[1] She dreams to break the boundaries of her confined existence of middle class values. The story is also about Sooraj, who is a self-made man. Sooraj owns a famous sweet shop near his house.
Sooraj and Sandhya get married under strained circumstances. She struggles with her strict mother-in-law who does not accept that her daughter-in-law could become a police officer. The story shows how a husband becomes his wife's strength and helps her to fulfil her dream. Sandhya completes IPS training and wins the Best Cadet Trophy. The programme now shows her work as an ASP in Pushkar. Sooraj gets the title of World's Top Cook.
Two terrorists come to Sandhya's house disguised as a simple poor woman and Sooraj's helper. They mislead Sooraj and others that Sooraj has to go Dubai. So everyone makes preparations to go to Dubai. Chaturi, Bhabo and Sooraj go to Dubai but their flight was hijacked by disha- sooraj's helper, Prema and their head called "Baiji"(Maya) Rajkumar's sister. Flight 2310 is hijacked while they are on the plane.The hijackers demand for Rajkumar's freedom.They kill 3 people and everyone's lives are in danger.Sandhya manages to capture them with the help of Zakir and Arjun. They kill Maya, Prema and Disha. But unfortunately Bhabo gets shot while she was saving Sooraj. Babasa blames Sandhya for for all this, while Sandhya and Zakir get praised all over the country .