Who's at the Door?

Due to an unfortunate accident, 17-year old Jamie Patterson had to decline a Hawaiian cruise with her family and stay at home. To protect the home while they were away, Jamie's father installed a video-monitored doorbell. Little did Jamie know that the device that was supposed to guard her would ultimately become her biggest nightmare. At 3:33 PM, Jamie received a notification on her phone that the doorbell rang; however, there was no one at the door...With the aid of her estranged boyfriend, Jamie unravels a mystery more dangerous than she could possibly imagine in order to answer one simple question: "Who's at the door?"