Life, the Universe, and Everything
Douglas Adams
Hitchhiker's Guide to the Galaxy (3)
So Long, and Thanks for All the Fish
Hitchhiker's Guide to the Galaxy (4)
The Restaurant at the End of the Universe
Hitchhiker's Guide to the Galaxy (2)
Salmon of Doubt: Hitchhiking the Galaxy One Last Time
Dirk Gently (3)
The Hitchhiker's Guide to the Galaxy
Hitchhiker's Guide to the Galaxy (1)
Mostly Harmless
Hitchhiker's Guide to the Galaxy (5)
Dirk Gently's Holistic Detective Agency
Dirk Gently (1)
The Long Dark Tea-Time of the Soul
Dirk Gently (2)
The Ultimate Hitchhiker's Guide to the Galaxy