If you want the real flavor of thriller in Bengali you have to read Byomkesh. And Radio Mirchi has also done some Sunday Suspense episode on Byomkesh. There were handful of stories like Raktamukhi Neela , Marorshar Rosh and Satyaneshi. And they are really masterpiece from the literature and thrill aspect.
Now you can download those two Byomkesh bakshi episodes from here.
Satyaneshi [Download] First story of Byomkesh Bakshi series.
Marorshar Rosh in MP3 [Download]
Raktamukhi Neela in MP3 [Download]
More Sunday Suspense Free Download