Qaidi Band is a story of undertrials who come together to form a band in jail and their music becomes their only hope for freedom. Sanju (Aadar Jain), Bindu (Anya Singh), Rufi (Mikhail Yawalkar), Tatyana (Anna Ador), Cyndy Khojol (Sange), Ogu (Peter Muxka Manuel) and Maskeen (Prince Parvinder Singh) are undertrials in a prison in India. The jailor, Devender Dhulia (Sachin Pilgaonkar) decides to form a band in jail, comprising of both women and men. His idea is to get them to perform on patriotic songs on Independence Day in the presence of a popular politician and earn brownie points. After a round of audition, the aforementioned undertrials are selected. They manage to practice and perform very well. The media covers the performance and thanks to their coverage, their songs go viral and they become overnight stars. This also makes it difficult to get bail as the demand is to continue with their jail performances. How these undertrials then decide to do the unthinkable forms the rest of the film.