Nine's Legacy
Pittacus Lore
The Lorien Legacies: The Lost Files (2)
The Calculating Stars: A Lady Astronaut Novel
Mary Robinette Kowal
Lady Astronaut (1)
The Rise of Nine
The Lorien Legacies (3)
Five's Legacy
The Lorien Legacies: The Lost Files (7)
Mostly Harmless
Douglas Adams
The Hitchhiker's Guide to the Galaxy (5)