BOOKED By Kwame Alexander314 pp. Houghton Mifflin Harcourt. $16.99. (Middle grade; ages 10 to 12) Kwame Alexander gives readers a bit of a head fake with the title of his latest novel in verse, "Booked." This is going to be a story about soccer, the title seems to say, but what Alexander has written is a book about the power of language.