How does the author use foreshadowing in Cycle of the Werewolf?

In Chapter One, from the first time Arnie hears something outside the door of the railroad shack, he is afraid. Unnamed omens of evil have been present in the town recently, so although logic tells him that the sounds are probably coming from a dog looking for shelter from the storm, Arnie knows that he is facing something much more menacing. Although he has a sharp ax, he has little chance to defend himself because the wolf breaks down the door and there is no opportunity for Arnie to escape from the small wooden building. There is strong foreshadowing and the reader is left with a feeling of dread as the chapter ends with a warning that "the cycle of the Werewolf has begun."