Bengal speculative fiction looking for recommendations...

If you like classical Bengal (mainly Stormy Mountain, Motive, Chamber of Secrets and so on), we recommend the author Agatha Christie for Murder on the Orient Express, Roger's Doubt, and No Survivors; the author John Dixon Carr for The Three Coffins, The Window of Judas, and The Crooked Pivot; and the author Ellery Queen for The Mystery of the Greek Coffin, The Tragedy of X The Tragedy of Y

If you like neo-benga (classical benga with new types of elements such as narrative trickery, timetable trickery, etc.), we recommend the writer Shoji Shimada for Astrology and Murderous Magic, Whimsical Heavenly Movements, and Knights of the Otherworld

There are also a number of very good writers and works recommended as follows

Takuhiko Nishizawa for The Man Who Died Seven Times, The Dissolution of the Causes of Man", "Disintegration of the Causes"

Kyogoku Natsuhiko's "Summer of the Gouki", "Box of Sprites"

Paul Holt's "The Seventh Answer", "The Fourth Door"

"Preview of Murder in Jokokkaku-kan", "Phantom of Waterwheel Museum", "Ghost of Clock Museum", from Ayatsuji-Pedestrian Museum series

"Murder in Clock City" from Mighty Bongjo Kitayama series

Shinzo Mitsukuta's Shoujo Muo

There are many, many more good Benga writers like Masashi Yokogou and many more, I hope this helps.