In the alternate universe of this novel, Bobby Thompson's "shot heard 'round the world" never happened. Oh, he hit the ball, all right, but it was turned to a cinder by a blast from a flying saucer and turned into a ground-rule double. Dodgers win! And aliens land. All those movies us old guys saw in the '50s, the black and white ones about alien invasions? In this universe, they were documentaries.
Now it's 20 years later. The book's mutant protagonist, J!m (pronounced Ji' 'm, though hardly anybody bothers with that; they just call him "Jim") is in high school, and if you think adolescence is hard for humans, well, it's even tougher for mutants. J!m's best friends are Jelly, who's more or less like The Blob, and Johnny, who's a radioactive half-apeman descended from a giant ape that we all know and love.
Part screenplay, part double-feature drive-in movie, the book careens along with references and winks at just about every old monster movie you can think of, and some you probably can't. I can't really describe it. It works (for me) more often than not, and parts of it are very funny. For example this description of the high school: "The three-story brick edifice had a stone facade cast with shields, eagles, arrows and other symbols of higher learning, and a central bell tower that had remained locked ever since Dr. Terwilliker, the old music teacher, had castrated dozens of pupils up there, using the pealing bell to mask their girlish screams, in hopes of creating an unstoppable five-hundred-boy soprano army, his plans becoming vague from there." If that doesn't amuse you, this isn't your kind of book.
I recommend checking out the book's website, one of the best I've seen. Be sure to click on the jukebox so you can listen to some of the great songs. For that matter, any website that uses "Rebel Rouser" on the homepage is great in my book.