Francis Mosses is the new doorman at Apartment 61, working for the Doppelganger Detection Department (D.D.D.). He's responsible for protecting residents and identifying threats. He's become familiar with the schedules of most residents, but the milkman's schedule is a mystery. It varies by day, week, and season, making it difficult for Francis to track. The milkman's cap always reads "Milkman," and Francis has noticed him returning home covered in blood on several occasions. This raises concerns about whether it's a doppelganger or something more sinister.