The Sphinx (Area 51 Book 4)
The Reply (Area 51 Book 2)
The Grail (Area 51 Series Book 5)
Excalibur (Area 51 Book 6)
The Truth (Area 51 Book 7)
Nosferatu (Area 51 Series Book 8)
Legend (Area 51 Series Book 9)
Area 51 (Area 51 Series Book 1)
Area 51: Redemption
Area 51: Invasion