The Door - Short

Josh Riley can't sleep. He feels frustrated, so he decides to go downstairs while his parents are fast asleep. After devouring left over pizza, he retreats upstairs, but he hears three soft knocks at the door – he’s not the only one awake. When he reaches the front door, he looks through the peephole. A dark figure stands outside. Another three knocks come again, this time faster and louder.
Before Josh can do anything, he hears his dad call out to him from outside. Josh turns on the porch light and peers into the peephole. Baffled by how his dad ended up outside, Josh opens the door and steps out – a deadly mistake. It’s not his dad. It’s a rotten, evil monster hungry for Josh’s flesh. As soon as Josh runs inside, the monster takes a hold of Josh and drags him outside to meet his doom.
Meanwhile, Josh's parents, Peter and Jane, are still upstairs, but Peter wakes up from a nightmare about someone taking Josh away. Jane tries to reassure Peter that it was only a nightmare. As Peter sits in the dark bedroom, he sees a dark figure in the corner. When he switches on the light, there’s nobody there. Peter feels unsettled and decides to check in on Josh, but he's shocked when he sees his empty bed. He rushes downstairs and sees blood on the floor and on the door frame. Peter opens the door and rushes out, but Josh is nowhere to be seen. The same dark figure reappears. Peter’s horrified to discover blood and entrails smeared across the porch with a menacing message written in blood. The monster attacks Peter and drags him outside, just like Josh. Peter calls to Jane, but it’s too late.
Jane rushes downstairs, unable to find Josh or Peter, but all of a sudden she hears three soft knocks at the front door. Peter calls out to her to open the door. Jane opens the door and suffers the same fate as Josh and Peter.
Who this monster is and why it targeted the Riley's...nobody knows.