It is the wedding of the youngest son of Dhanraaj, a high-profile industrialist. But this joyous occasion turns tragic when Dhanraj's eldest son, Girish, is shot dead, mouthing the letter "O" on his deathbed. Meanwhile, the middle son, Kunal goes missing. Who is "O"? Is the killer an outsider or someone from within the family? Will CID uncover a horrendous family secret?