Dirk Gently's Holistic Detective Agency
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Dirk Gently (1)
The Hitchhiker's Guide to the Galaxy
Hitchhiker's Guide to the Galaxy (1)
Life, the Universe, and Everything
Hitchhiker's Guide to the Galaxy (3)
The Long Dark Tea-Time of the Soul
Dirk Gently (2)
Mostly Harmless
Hitchhiker's Guide to the Galaxy (5)
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)
So Long, and Thanks for All the Fish
Hitchhiker's Guide to the Galaxy (4)
The Ultimate Hitchhiker's Guide to the Galaxy