Mongoose is a young teen who is being led down the road to serious delinquency by his best friend Weasel. From shoplifting to vandalism, their crimes are getting bigger, as are Weasel's plans to drop out and live on the streets. When they find the card Weasel tosses it away. But it keeps reappearing, and Mongoose finally steps into a library for the first time in his life to find out about a strange bug he encountered while spray painting a tree. When he hands the card to the librarian on the way in, she says, "No, this is not to let you in. It's to let a book out." The book she gives him is called "I Wonder," and it contains far more than just the bug he was looking for.
Brenda is a TV addict, and when her parents decide to participate in a week long Great TV Turn-Off, she is completely lost. When she finds the card she hangs on to it because its blue rectangle reminds her of the TV set. But when she sleepwalks her way to the library, she finds a letter addressed to her which guides her to her own biography. She is fascinated to read about her own early childhood, but the words abruptly end after the first time she turns on the TV, and the rest of the pages are blank. So she becomes maniacally determined to fill them
Sonseray is homeless, living in a car with his father. Though he appears hardened and is constantly in trouble, his mother's death from a drug overdose years ago has left a hole in his life that he just can't fill, no matter what he does. But Miss Storytime at the library has a surprise for him.
April's new life on the mushroom farm her parents bought is less than appealing. When she goes on a hike trying to escape the ever present smell of the horse manure that the mushrooms grow in, she connects up with a bookmobile that is being hijacked by a teenaged runaway.