In 1902 London, unhappily married Philip Marshall meets young Mary Gray, who is unemployed and depressed. Their deepening friendship, though physically innocent, is discovered by Philip's wife who threatens him with exposure and scandal, driving him to kill her. Thereafter, fortune seems to smile on Philip Marshall| but does fate have a surprise in store?。A family reunion at a remote mansion takes a lethal turn when they are trapped inside and forced to play a deadly survival game where only one will make it out alive.。