Shantilal and the butterfly mystery) is an Indian Bengali mystery-thriller film, directed by Pratim D. Gupta.

[1] Shantilal, a deadbeat weather reporter of a Kolkata based newspaper, who is in his late 30s, still unmarried and lives with his mother.

[2] The screenplay of the film was selected for the 2013 Indian edition of the prestigious Sundance Lab, organised by Sundance Institute, where Pratim got to discuss and dissect his script with international writers and directors like Asif Kapadia, Bill Wheeler, Joshua Marston, Carlos Cuaron and Marti Noxon.

[3] The script was subsequently read by actor Irrfan Khan who wished to direct the film for private television channel.

[4] This is the fourth collaboration of Pratim and Ritwick after Shaheb Bibi Golaam, Maacher Jhol and Ahare Mon.