Aubrey and Paul Davison welcome his family for a reunion in their isolated vacation house. Their sons Crispian comes with his girlfriend Erin; Felix with his girlfriend Zee; Drake with his wife Kelly; and their daughter Aimee comes with her boyfriend Tariq. When they are ready to have dinner, they are attacked by a stranger with a crossbow, and Drake is wounded by an arrow and Tariq dies. They discover that their cell phones are jammed and they are trapped in the house. Erin tries to protect the house, closing doors and windows, but the masked killers murder the members of the family. Are the killers lunatic? What is the motive for slaughtering the Davison family?