Francis Mosses is the doorman at Apartment 61, working for the Doppelganger Detection Department (D.D.D.). He is responsible for protecting residents and identifying threats. He has become familiar with many neighbors' schedules, but the milkman remains a mystery. The milkman's behavior is erratic and unpredictable, causing Francis considerable anxiety. Francis is disturbed by the milkman's suspicious appearance and unsettling behavior, questioning if he is a doppelganger or something more sinister.