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Jessica Wakefield has always prided herself on being the more sophisticated twin, but suddenly it's her sister, Elizabeth, who's blossoming. Overnight, something wonderful has happened to turn Elizabeth into a young woman. And now Jessica's sure that if anyone - especially her sister - finds out that it hasn't happened to her, she'll die of humiliation. Then the twins get permission to travel to San Diego by themselves to visit their cousin Robin. It's the perfect opportunity for Jessica to prove just how grown-up she really is. But will acting older than her age get Jessica into more trouble than she can handle?