Tragedy divides the Grey Griffins, but their united quest to capture Von Strife continues, pitting them against killer clockworks, spider-like beasts, and an army of animated dead as they work together to prevent the building of The Paragon Engine. Tragedy divides the Grey Griffins, but their united quest to capture Von Strife continues as they work together to prevent the building of the Paragon Engine. The coauthor is J.S. Lewis. Book #2
Source · Open Library