It is a Diwali party. The whole family is assembled in the house of Ammaji- Sunaina Divwedi. Reluctantly. Resentfully. But they are there. For when Ammaji summons people obey. Whether they want to or not. She is the matriarch- the center of this large talented and egoistic family of Divwedis. And she holds them in her web. Even her ex-husband Naresh Divwedi. Who comes every year with his second wife Ruby and his two sons- Ritesh and Angad. For this annual gathering during Diwali. Barbed comments, covert hostility, scenes between the two families are the norm. But today something is amiss......Something in the air...Something evil rearing its ugly head....... A woman screams as the fireworks explode into the dark night....And the Diwali turns black. For Naresh Divwedi is found murdered in the study with his head bashed. S.P. Apurv Chaturvedi ( C.I.D.) is assigned the case. It is his toughest assignment so far. Eighteen people in the house. One dead. Seventeen suspects. A dead man whom several people loved to hate. A man whom women adored and men hated. A man whose children disliked him. Motive? Plenty. Suspects? Plenty. Finding the murderer? Virtually impossible. And to make matters worse is Ritu Dhingra- Sunaina's granddaughter. The lovely talented Ritu who threatens to make Apurv lose his objectivity. As Apurv plumbs into the depths, secrets unfold. Lies, deceit, intrigue. Just as he thinks he has the answers and is getting close the murderer strikes again. Sunaina's widowed sister is killed. Asphyxiated after being drugged. And Apurv finds himself up against a diabolically clever murderer. One of the remaining sixteen is a murderer. But who? Is it Naresh's wayward son Romi whose fingerprints on the murder weapon dub him the murderer? Is it Ritesh's neurotic wife Tanya who is seen by Sunaina's elder son Rajesh kneeling by the flower bed where the murder weapon is recovered? Is it aggressive Ritesh living down an alcoholic past who was disinherited by his father? Is it Ruby- Naresh's second wife whom he was leaving? Then Sunaina is poisoned. The sweets given to her by Ruby are poisoned. And yet Ruby proclaims her innocence loud and clear. What is the truth? Will Apurv find the answers in time to save Ritu who is in mortal danger? Or will he lose the woman he loves to the murderer forever?