A secluded family retreat further into isolation after news of a pandemic arrives. The family spirals as the Fathers instability forces the Daughter to choose to trust her father or herself.

8 years since the second sequel, SLD3 follows the harrowing conclusion all those years ago. Ethan has unravelled into a spiral of self destruction and a whole new cast joins the ensemble from henchman Ryder and Ethan's boyfriend Matt. Unanswered year old lies will be revealed, worlds will collide, and only the tough will survive in this final and unexpected sequel!