Charlie is recruited to use his mathematical prowess to discover what happened to a box of stolen moon rocks in this follow up to Bringing Down the Mouse. The K

When sixth-grade mathematical genius Charlie Lewis is recruited to recover moon rocks taken from NASA's vaults, the Whiz Kids enter a paper airplane contest hos

When Charlie's classmate Anthem mysteriously disappears after bringing a supposed space rock to show-and-tell, the Whiz Kids trace his steps to his eerily empty

Charlie and the Whiz Kids discover a prehistoric mammoth tusk and stumble right into the nefarious clutches of an eccentric billionaire in this hilarious third

“This rich volume is a national treasure.” —Kirkus Reviews (starred review) “Captivating, informative, and inspiring…Easy to follow and hard to put do