One year ago, Iris's world turned upside down. Haunted by nightmares of her mother's traumatic death, Iris has become a sleep-deprived, jittery version of herself who she hardly recognizes anymore. So when she's given the opportunity to get away from the crushing grind of reality for a relaxing week with her partner and his close-knit group of friends, she jumps at the chance.

But after she arrives early to the remote lake house in the Catskills, things take a dark turn. Alone in the cabin in the middle of the night, Iris sees a blood-covered man burying something--or someone--in the mud behind the deck before entering the house. But the daylight reveals nothing, the dirt unturned and the house pristine.

As strange and increasingly disturbing discoveries begin to stack up, her fellow house guests refuse to take anything Iris has to say seriously, and she begins to suspect that someone might be gaslighting her. If the stress hasn't finally gotten to her, that is. Determined to uncover the truth, Iris finds herself drawn into a terrifying game of cat and mouse. Is it all in her head, or is there really a killer among them? Can she trust anyone...even herself?