Kalo Bhromor is a murder mystery in which Hari the caretaker of the guest house Kalo Bhromor and Saathi, the daughter of the owner of the Kalo Bhromor are murdered and Smriti, Saathi’s sister is raped. Smriti and Saathi’s sisters Saswati, Srija, Nilabha, Saswati’s husband, Sabuj, Nilabha’s brother are the suspects with other residents of the guest house. The story unfolds gradually to uncover the real culprit.