When Alex, Mattie, and Sophie touch the spyglass, they find themselves hurtled back to 1898, where real-life dinosaur cowboy Walter Granger has a job for them. Granger has discovered a secret cache of dinosaur skeletons. But someone�s trying to steal the bones for himself. Can the Time Spies catch the thief before the spyglass sends them home? �Candice Ransom�s spare writing style should make history accessible to reluctant readers.� �Vivian Vande Velde, author of A Hidden Magic