Silly.
If you've never read Christopher Paul Curtis's books before, this would not be a good one to start with. Instead, I highly recommend either "The Watsons Go to Birmingham - 1963" or "Bud, Not Buddy," as both of those books are 5-star caliber.
This story is not close to those classics.
This story follows the adventures of Steven, a boy who is trying to become a detective while serving others in his community. One day as he helps a local blind man, Mr. Chickee, back and forth to the grocery store, he receives a quadrillion-dollar bill for his assistance. The bill features the legendary James Brown, of whom Steven knows nothing about.
However, instead of discovering more about James Brown, Steven becomes consumed with whether or not the bill is authentic. He first asks his dad, who responds as I probably would have, telling Steven that the bill is not real. Then he asks his mom, who responds that the bill seems authentic. She pressures her husband to call the government. In no time at all, Steven and his dad are meeting with a federal agent from the U. S. Treasury Department in order to get more information about the money.
From this point, the silly thoughts and antics of a nine-year-old boy take a back seat to the silly plot that follows. I would typically have quit the book at that point, but because the other Curtis books I've read were so good, I was compelled to finish, but this one never reached the level of the others. I'm not sure I would have enjoyed this story as a nine-year-old either.
Instead, be sure to check out "The Watsons Go to Birmingham" or "Bud, Not Buddy" for a better read from Christopher Paul Curtis.