Chilean-born novelist Isabel Allende, currently on tour promoting her first children's book, City of the Beasts, has just signed for a new book, a highly personal memoir, with her HarperCollins editor Terry Karten. It's called My Invented Country, and will be, said the editor, a nostalgic account of the author's exile from her native land after the 1973 assassination of her uncle, President Salvador Allende, and her eventual adoption of the U.S. as her new home. Karten bought world English and North American Spanish-language rights in the book, plus audio, from Barcelona agent Carmen Balcells and will publish next summer.