The Tick-Tock Man: Gadgets and Gears, Book 3 (Paperback) (ISBN-13: 9780544937154)

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.