Abigail Clayton独自一人生活，已将近20年没有离开她的公寓。当她的邻居死亡，侦探Frank Giardello登门造访展开调查，她原本秩序井然的世界开始瓦解。
　　Abigail Clayton独自一人生活。一个人非常孤独。实际上，这位女继承人没有离开她的曼哈顿公寓已将近20年。当她年迈的邻居死亡促使纽约市警察局凶杀案侦探Frank Giardello登门造访展开调查，内心恐惧不安的Abigail Clayton看到那位侦探在她门外，询问她。Abigail Clayton曾试图收购现在空置的那个公寓以确保她的隐私，当新租户莉莲和查理搬进来时就更加烦恼了。Abigail Clayton焦急地从她的前门的安全窥视孔监视她的新邻居，但当她终于面对面地遇到了莉莲和查理时她原本秩序井然的世界开始瓦解，她庇护的存在也开始成为意外和恐怖的方式威胁着。
　　An heiress who's been shut inside her apartment building for nearly two decades is forced to confront her fears after one of her neighbors is killed and a detective arrives to begin the investigation.
　　Abigail Clayton lives alone. Very alone. In fact, the attractive heiress has not left her Manhattan loft apartment for almost two decades. The famous daughter of a wealthy industrialist, Abigail disappeared from the prying eyes of the press and the intrusiveness of her family on her 18th birthday, the day she received her massive inheritance. During years of self-imposed isolation, Abigail has had contact with only two people-her building's Concierge, Klandermann, with whom she communicates via notes-and Dr. Raymond Fontaine, a longtime family friend and her sole confidant for most of her life. When the death of her elderly neighbor prompts NYPD Homicide Detective Frank Giardello to launch an investigation, the agoraphobic Abigail is distressed to find him outside her door, asking to question her. Having tried to acquire the dead woman's now vacant apartment to ensure her privacy...
　　A reclusive Manhattan heiress finds her carefully structured world beginning to crumble after her elderly neighbor dies, and a young couple moves into the vacant apartment. On her 18th birthday, Abigail Clayton (Selma Blair) received a staggering inheritance from her late father, an affluent industrialist. That same day, Abigail also escaped the probing lenses of the paparazzi by sealing herself away from the world in her massive loft. Nearly twenty years later, the only people Abigail interacts with are Klandermann (Kevin Pollak) the Concierge, and Dr. Raymond Fontaine (Beau Bridges), a trusted family friend. One day, Abigail's elderly neighbor dies under mysterious circumstances, and Homicide Detective Frank Giardello (Giovanni Ribisi) comes knocking on Abigail's door looking for answers. Concerned that the open apartment could provide a perfect perch for prying eyes, Abigail inquires about purchasing it to no avail. Shortly thereafter, Abigail spies Charlie (Jason Lee) and Lillian (Amy Smart) moving into the apartment. In the weeks that follow, Abigail begins religiously using her peephole to scrutinize her new neighbors' every move. But she can't stay locked away forever, and the moment Abigail meets Charlie and Lillian in person, the nightmare begins.
　　Abigail Clayton (Selma Blair) lives alone. Very alone. In fact, the heiress has not left her Manhattan apartment for almost two decades. When the death of her elderly neighbor prompts NYPD Homicide Detective Frank Giardello (Giovanni Ribisi) to launch an investigation, the agoraphobic Abigail is distressed to find him outside her door, questioning her. Having tried to acquire the now vacant apartment to ensure her privacy, Abigail is further upset when new tenants Lillian (Amy Smart) and Charlie (Jason Lee) move in. Abigail anxiously monitors her new neighbors from the safety of her front door's peephole, but her well-ordered world begins to unravel when she finally encounters Lillian and Charlie face-to-face and her sheltered existence becomes
　　threatened in unexpected and terrifying ways.