Byomkesh Gotro is a Bengali-language detective thriller film directed by Arindam Sil[1] and based on a Byomkesh Bakshi story Rakter Daag by Sharadindu Bandyopadhyay.

[4][5] Satyakam, a young boy comes to Byomkesh in Kolkata and introduces himself as the son of a business magnate from Mussourie.

He invites Byomkesh to come to Mussoorie because he feels that his life is under threat.

When Byomkesh reaches Mussoorie, he finds that Satyakam was murdered mysteriously.

Boymkesh starts an investigation which reveals a dark history of Satyakam's family.