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