MULK is the story of a family facing extreme crisis when one of their own is accused of being a terrorist. Murad Ali Mohammed (Rishi Kapoor) is a respected lawyer in Varanasi and he lives there in an almost century old building with wife Badi Tabassum (Neena Gupta), brother Bilal (Manoj Pahwa), Bilal's wife Choti Tabassum (Prachee Shah Paandya), Bilal's daughter Aayat (Vartika Singh) and Bilal's son Shahid (Prateik Babbar). The Mohammeds are planning a grand party on the occasion of Murad Ali's 65th birthday. His daughter in law Aarti (Taapsee Pannu), married to his son Aftab (Indraneil Sengupta) comes from London and surprises them.
On the same day as Murad Ali's birthday, Shahid leaves at night under the pretext of watching a cricket match at Kanpur. Unknown to the family, he has been brainwashed and he carries out a bomb blast in Allahabad, killing 16 people. Shahid is spotted in the CCTV footage and a hunt begins for him.
He's finally found and is eliminated by officer Danish Javed (Rajat Kapoor). For the Mohammed family, the world comes crashing down. Bilal is accused of helping out Shahid with the terror attack and is arrested. What happens next forms the rest of the film.