In Famfield, the teenager Amber feels displaced and dreams on moving to Chicago. When she learns that she is the foster daughter of her mother, she decides to move to the big city. Amber has a short schedule to pay the rent of an apartment in Chicago and she convinces her friends to travel with her to the windy city. However the van breaks down and they hitchhike on the road. The truck driver Bernard offers a ride to the group but they need to travel inside the back of a semi. Bernard does not stop the truck and they realize that they have been kidnapped. When he finally stops and opens the semi, they find that they are inside a dirty warehouse. Sooner they are hunted by fast blood-thirsty creatures and their leader Veronica discloses a secret to Amber.