不速之客悄然降临，打破了宁静夜晚，带来了意外的惊喜与未知的故事。于无声处听惊雷

　　A young couple Mira (Abbie Cobb) and Todd (Sean Faris) hire a live-in nurse (Lyndon Smith) to be the caregiver for their sick son, only to discover that she is an "angel of death" intent on replacing Mira through any means necessary.