Jack's been here a long time. He knows the ropes, and he's only too happy to pass along that information to his young apprentice, a new patient in a Minnesota state hospital in the 1950s. Walking the mail route, Billy learns tidbits that could make his life easier in the coming months—and could potentially save it. Encountering patients with a variety of illnesses, Billy is astonished to learn what goes on behind the stately walls of the hospital, away from families' prying eyes. With only one day to learn before flying solo, Billy must take it all in. Above all, he must stay on his guard.