New York, November 3, 1954. In a few days, the immigration inspection station on Ellis Island will close its doors forever. John Mitchell, an officer of the Bureau of Immigration, is the guardian and last resident of the island. As Mitchell looks back over forty-five years as gatekeeper to America and its promise of a better life, he recalls his brief marriage to beloved wife Liz, and is haunted by memories of a transgression involving Nella, an immigrant from Sardinia. Told in a series of poignant diary entries, this is a story of responsibility, love, fidelity, and remorse.