In this latest Time Warp Trio entry, Fred, Joe, and Sam have sworn off using that volume of dangerous time-travel, The Book. When Fred sticks Sam’s summer reading list inside it, they find themselves whisked off, not to another time, but to a world where all the characters from the books on the list are congregated, where the evil characters are determined to crush all the good characters and take over the stories. Aided by the Girl, who seems to be a composite of female heroines from all the formula series books the boys never read, Fred, Joe, and Sam battle the leader of the bad guys, an embittered Mr. Bear (“Just because I’m a teddy bear, I get no respect”) to find The Book and get back to the real world. Filled with humorous action and suspense, this book will have special appeal to those who get the hip-deep references to dozens of children’s books (without such understanding, the middle section becomes somewhat incomprehensible). With plenty of action and silly humor, the book itself is a pretty good addition to summer reading lists. (b&w illustrations, not seen) (Fiction. 7-11)