Sonakshi Sinha will be playing Dalbir Kaur, sister of Sarbjit Singh, the Indian prisoner, killed in Pakistan's Kotlakhpat jail after 22 years of imprisonment. The film on Dalbir's valiant fight to get her brother released is being produced by Mukta Arts. Subhash Ghai has kept the project under the wraps.

Though Sarabjit, a native of Punjab, died this year after an attack by fellow inmates, his life story and his sister's long struggle to bring him back home, captivated the nation. Buzz is, Ghai has already taken the required permission from Sarabjit Singh's family and Dalbir has given her nod of approval.

A source said that the film which would recreate Dalbir's efforts to free her brother from prison was being written by Rajesh Berry. "It is a sensitive topic. Ghai's team does not want to make any mistakes. Dalbir has given a long version of her battle to free her younger brother and Berry is in touch with her frequently," said the source.

"Sonakshi took her time to say yes but her excitement about the role was clearly visible when she first heard about the role," added the source.

The film will be directed by ad-filmmaker Ishwar Singh Muchla. The project is likely to go on floors early next year. As of now, Ghai and Ishwar are scouting for the actor who will play Sarabjit Singh.