The first novel written by Sunil Gangopadhyay is :
[A]Athmo Prakash (Self-Revelation)
[B]Pratham Alo (First Light)
[C]Purba Pachim (East and West)
[D]Shei Shomay (Those Days)

Athmo Prakash (Self-Revelation)
Starting off his six-decade literary career as a bohemian poet and editor of Kritibas, a monthly poetry magazine, Sunil Gangopadhyay wrote his first novel, Athmo Prakash (Self-Revelation), at the behest of the editor of the hugely popular periodical Desh for its special Durga Puja edition. Two of the most critically acclaimed films of legendary filmmaker Satyajit Ray — Pratidwandi and Aranyer Din Ratri — were based on novels written by him.