The story follows Riley through adolescence, as she explores new emotions such as Anxiety and Envy.
After the events that took place in the third part, when a new threat appears in the city of Miami from some bad boys, the police must confront them forcefully and firmly while imposing control.
As an artist is stranded in a forest in western Ireland, she arrives at a bunker and meets three strangers. Over time, the foursome is attacked by strange creatures every night.