Wally and Noodles are back to the business of scientific innovation--and fun. In London, they meet a young pickpocket named Dobbin who works for a mysterious criminal called the Tick-Tock Man. Soon they are racing through secret tunnels in a bid to help Dobbin's little sister. Can the brave boy-scientist and his loyal sidekick find the one person who can save her before it's too late? History and technology collide in this humorous series brimming with mad science.

Kersten Hamilton is the author of several picture books and many novels, including the middle grade Gadgets and Gears series and the critically acclaimed YA trilogy The Goblin Wars. She splits her time between her home in Albuquerque, New Mexico, and her farm in Kentucky. For more about Kersten, please visit www.kerstenhamilton.com.