Plot: Annie's sister Donna, who has come to town in hopes of reviving her singing career, discovers Richard's secret love letter to Caroline (inside Annie's diary) and uses it as inspiration for a new song, to Richard's horror and Annie's fury, since she has been using the letter to blackmail Richard into taking her mother to electrolysis appointments. Caroline is preoccupied with her perfect plain black pumps, which she left in Joe's apartment; after a fruitless quest to replace them, she sneaks in to retrieve them, and is found by a repentant Joe