You can download Qaisar o Kisra ( urdu قیصر و کسریٰ ) by Naseem Hijazi free in pdf format. This is a great historical novel of Naseem Hijazi.
About Naseem Hijazi
Sharif Hussain, who used the pseudonym Nasīm Hijāzī, was an Urdu writer. He was born in an Arain family in the village of Sujaanpur near the town of Dhariwal, in the Gurdaspur district of Punjab.