Series reading guide · updated 2026

Department Thirty Books in Order

Every Department Thirty book in publication order — 4 in total, spanning 2003–2006.

Publication Order of Department Thirty Books

#	Title	Year	Get it
1	Department Thirty	2003	Amazon US UK
2	The Mesa Conspiracy	2004	Amazon US UK
3	The Blackjack Conspiracy	2005	Amazon US UK
4	The Triangle Conspiracy	2006	Amazon US UK

#	Title	Year	Get it
1	Department Thirty	2003	Amazon US UK
2	The Mesa Conspiracy	2004	Amazon US UK
3	The Blackjack Conspiracy	2005	Amazon US UK
4	The Triangle Conspiracy	2006	Amazon US UK

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