There are 3 books in the Dirk Gently series. The newest book is The Salmon of Doubt which came out in 2002.

1
Dirk Gently's Holistic Detective Agency

Book cover of Dirk Gently's Holistic Detective Agency
From Douglas Adams, the legendary author of one of the most beloved science fiction novels of all time,Ā The Hitchhikerā€™s Guide to the Galaxy, comes a wildly inventive novel of ghosts, time travel, and one detectiveā€™s mission to save humanity from extinction.

DIRK GENTLYā€™S HOLISTIC DETECTIVE AGENCY
We solve theā€¦

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2
The Long Dark Tea-Time of the Soul

Book cover of The Long Dark Tea-Time of the Soul
Beloved, bumbling Detective Dirk Gently returns in this standalone novel from Douglas Adams, the legendary author of one of the most beloved science fiction novels of all time, The Hitchhikerā€™s Guide to the Galaxy.

When a check-in desk at Londonā€™s Heathrow Airport disappears in a ball of orange flame, theā€¦

3
The Salmon of Doubt

Book cover of The Salmon of Doubt

The Salmon of Doubt is Douglas Adams's indispensable guide to life, the universe and everything. It includes short stories and eleven chapters of a Dirk Gently novel that Douglas Adams was working on at the time of his death, and features an introduction by Stephen Fry.

This sublime collection dipsā€¦