Gillian Blake has always been second best to her twin sister, Avairy. But when her parents decide to take darling Avairy to New York for a month, who's to say Gillian has to obey by the rules? Who's to say that Gillian wasn't the one who went away, and Avairy the one who stayed behind? Yes indeed, who's to say that Gillian couldn't be Avairy for a month?