Hidden behind this visible world lies an invisible one. Rupak Saha's "Boro Pap" (The Great Sin) takes the reader on a journey to this supernatural realm. In the style of a realistic novel, Rupak crafts a narrative that effortlessly achieves credibility. Daksha's mother has died, and he comes to Gaya to perform the rituals for the peace of her soul. He offers the pindas (funeral offerings), but his mind remains restless. A girl named Hansika tells him about a hidden temple in Kashi, where it is said one can encounter spirits. With Hansika's help, will Daksha be able to reach that temple? To see his mother's spirit? To return from the temple alive? The reader becomes a participant in a rare experience in this novel, where death, grief, and guilt are intertwined. Supernatural and paranormal experiences are usually described in literature using complex, veiled, and symbolic language. Far from that, in a fast-paced, realistic prose, Rupak takes the reader along on Daksha's journey. What is sin? Who bears its burden? Does a child have to bear the burden of their parents' sins? At every turn of the story, these questions appear before the reader in various guises.