And The Upstairs Neighbor (S01E14)

When Max's upstairs neighbor turns up dead, Caroline is startled to learn that her friend has never bothered to meet anyone in their building. She bribes Max into giving out cupcakes as a gesture of neighborly goodwill, but the plan is interrupted when Sophie, the new tenant, moves in upstairs. Hostility between Sophie and the girls begins almost immediately, as Max responds to increased noise levels by writing a very threatening letter. When Sophie threatens to call the landlord on the girls, however, Max realizes that they're the ones who might be facing eviction if they don't make peace. (CBS TV Network)