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Agent 21 Books in Order
Below you'll find the complete list of Agent 21 books in publication order. This is generally the recommended reading order for the series.
Reading order verified: March 2026
Quick Answer
What order should I read the Agent 21 series? Start with "Agent 21" (2010) and follow publication order through all 7 books.
The complete Agent 21 reading order is listed below in publication sequence.
Publication Order
Agent 21
2010
Reloaded
2012
Codebreaker
2013
The Wire
2013
Deadfall
2014
Under Cover
2015
Endgame
2016
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