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Frasier volunteers to work on Christmas Day when he learns that Frederick will not be visiting him for the holidays. The callers are as depressed as Frasier, who decides to cheer himself up by eating dinner at a local diner, where the patrons assume he's homeless.
Niles and Frasier begin to suspect their father of cheating on their mother years earlier after they discover him in an apparent clandestine rendezvous with an old friend. The truth is revealed when the old friend spills the beans to Frasier.
Frasier and Niles agree to eat at Martin's favorite restaurant, not anticipating its "laid-back" atmosphere, which leads to the boys offending Martin.