Return to Mars (The Grand Tour Book 7)
Mars (The Grand Tour Book 4)
Leviathans of Jupiter (The Grand Tour Book 15)
Mercury (The Grand Tour Book 17)
New Earth (The Grand Tour Book 21)
Titan (The Grand Tour Book 16)
The Return: Book IV of Voyagers (The Grand Tour 20)
Saturn: A Novel of the Ringed Planet (The Grand Tour Book 14)
Venus (The Grand Tour Book 19)
Farside (The Grand Tour Book 9)