The Relic Hunters (Grey Griffins: The Clockwork Chronicles Series #2)

In just one semester at Iron Bridge Academy, The Grey Griffins have already had quite an education-clockwork robots, students with super powers, and a hidden land beyond our world where mystical creatures and incredible inventions exist. But as second semester begins, their friendship is put to the test-Max, Ernie, Natalia, and Harley are growing apart. When their arch nemesis Otto Von Strife reemerges with another evil plan, the Griffins must learn to set aside their differences and reunit...