Jighansa ( ) is a 1951 Bengali-language psychological thriller film cinematographed and directed by Ajoy Kar. Produced by Chayanika Chitramandir and Kine Craft Studios, the film is based on Hemendra Kumar Roy's novel Nishithini Bibhishika, which itself is a Bengali adaptation of Arthur Conan Doyle's crime novel The Hound of the Baskervilles (1902). The plot revolves around Kumar Bahadur, the predecessor of a royal family, who returns to his hometown to look into a rumour related to a haunted spirit. It stars Shishir Batabyal as the eponymous detective Smarajit Sen and Gautam Mukherjee as his assistant Bimal Ganguly. Biren Chatterjee, Manju Dey, Bikash Roy, Kamal Mitra and Kanu Banerjee star in pivotal roles.
It was released on 20 April 1951. It had musical scores done by Hemant Kumar.
The movie revolves around the unwanted incidents that happen in the princely state of Ratnagarh. After the murder of the king Chandrakanta, Dr. Palit asks for help from Detective Smarajit Sen, a family friend. Detective Sen sends his assistant Bimal to Ratnagarh to investigate and ascertain the security of young Kumar Bahadur, the new successor of the royal family of the estate. They observe that a mysterious lady, Manjushree, sings uncanny song while wandering around the adjacent water body. Mr. Gupta, a suspicious botanist, who stays in the neighbourhood also roams in that locality. It is revealed that he was deprived of real property of the royal family and took revenge by killing the members of the family. He uses a deaf and dumb porter as a hired killer. Ultimately, he is killed by the detective at the end before he could commit another murder.