19 books • 4 series
Book #2: The Cylons' Secret
Book #3: Sagittarius Is Bleeding
Book #1: Iron Axe
Book #2: Blood Storm
Book #3: Bone War
Book #1: The Doomsday Vault
Book #3: The Dragon Men
Book #4: The Havoc Machine
Book #2: Nightmare:
Book #3: Trickster
Book #4: Offspring