After a Haven police officer dies from a terrifying infection while inside the police station, the new Chief of Police that replaced Nathan seals the building shut — in order to contain the outbreak. Trapped on the inside, Audrey and Nathan suspect the force they face is no mere outbreak and that there’s something more sinister at play in the station — but their only aid on the outside is Dwight. Meanwhile, Duke brings Evi to the station to confront her along with Nathan.