Dum is the story of a goon named Xavier and his henchman Antony and the struggle they face to achieve their goals.

Rasheed (Lal) is a Malayali non-resident Indian working in the Gulf. He is on vacation in his hometown, Kozhikode in order to solemnise his daughter's engagement. Rasheed has invested in a commercial property next to his house which he has let out to store owners, except for one room. He hopes to use this room to start a business on his final return from the Gulf. During his holiday this room becomes a meeting place for Rasheed and his friends, where they bond over drinks every night. Manoharan (Sreenivasan) is a filmmaker wandering in the same city in search of a producer for his film.

The film tells the story of friendship. The story is centered around an eventful New Year celebration of five friends and the sequence of events following it in the next few days.

A woman in her fifties files a divorce petition against her seventy-one-year-old husband. Their son and an advocate try to find the reason behind it as they had been married for thirty years.

Isaak Ebrahim, a passionate and a struggling Indian filmmaker produces and directs his first movie which gets officially selected to the Oscars. Once nominated, Isaak gets to know about the hurdles and the unfriendly situations that can shatter his dream of winning the Oscar.