Mattie, Alex, and Sophie catch gold fever as they slide back in time to the 1897 Klondike Gold Rush. There they meet Jack London, a young writer, and Klondike Mike, a boy who dreams of striking it rich. After Mike's treasured sled dog is stolen, the Time Spies follow the dog's tracks to Jack's cabin. Is it possible that Jack London -- soon-to-be-famous author and dog lover -- is also a dog thief?

"You absolutely have to have series books in your home and library? Well, bypass all the other books out there and take a turn with Time Spies."
-- Betsy Bird, children's librarian at New York Public Library

Read a list of other books in the series.