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Description:  Punashcha Professor Shonku (Shonku Once Again) is a Professor Shonku series book written by Satyajit Ray[1] and published by Ananda Publishers in 1993. Ray wrote the stories on Professor Shanku in Bengali magazine Sandesh and Anandamela. This book is a collection of five of Shanku stories. Professor Shonku is invited by Professor Rondi to his residence in Milan for a demonstration of a time machine that Rondi has reportedly discovered. As Shonku accepts the invite, he is also disturbed learning the news of murder of another scientist Professor Klaiber at his residence in Cologne, Germany, who, Shonku knew, was also working on the time machine. At Rondi's residence Shonku helps out Rondi to fix some error in his machine and also develops a hunch that Rondi could have been the evasive murderer of Klaiber. With help of Enrico, Rondi's assistant, Shonku does a time travel to Cologne using Rondi's machine in his absence, and finds incriminating evidence against Rondi, and finally gets him caught by the local police.