One night, while working at the Mumbai Police Emergency Call Centre, police officer Nikhil Sood gets a call from a hysterical woman who wants to commit suicide. Even as he tries to save her, Nikhil has no idea that it will lead to him endangering his own family as dark truths that he has been hiding threaten to destroy all that he loves and stands for. Action,Thriller 'Dial 100' unfolds on a rainy night with Senior Police Officer Nikhil Sood beginning his shift in the Mumbai Police Emergency Control Room, just like any other day. Soon after, we learn that his personal life is in shambles as a result of his wife Prerna's (Sakshi Tanwar) troubled relationship with their teenage son Dhruv (Svar Kamble). While juggling with his wife's constant phone calls, Nikhil ends up taking a distress call from a hysterical woman who wants to end her life owing to a personal tragedy. When the anonymous caller gets a little too personal, Nikhil realises he has to race against the clock to keep the world from learning about a dark secret that could put his loved ones' lives in jeopardy.