In the fall of 1916, America prepares for war—but in the community of Tamarack Lake, the focus is on the sick. Wealthy tubercular patients live in private cure cottages; charity patients, mainly immigrants, fill the large public sanatorium. Prisoners of routine, they take solace in gossip, rumor, and—sometimes—secret attachments. But when the well-meaning efforts of one enterprising patient lead to a tragic accident and a terrible betrayal, the war comes home, bringing with it a surge of anti-immigrant prejudice and vigilante sentiment.