An ageing and wheelchair-bound Bhaskar Fernandez has finally reclaimed his family property after a bitter legal battle, and now wants to reunite his aggrieved relatives. So, he invites them to his remote Greybrooke Manor in the misty Nilgiris - a mansion that has played host to several sudden deaths; a colonial edifice that stands alone in a valley that is said to be haunted by the ghost of an Englishman.

But Bhaskar has other, more practical problems to deal with. He knows that his guests expect to gain by his death, and to safeguard himself against violence, he writes two conflicting wills. Which one of them comes into force will depend on how he dies.

 Into this tinderbox, he brings Harith Athreya, a seasoned investigator. When a landslide occurs, temporarily isolating them and resulting in a murder, Athreya finds that murder is not the only thing the mist conceals.