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Agent 21: Book 1

Agent 21 Series

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(8 reviews)

Most authors are just imagining what it’s like to live your very own action adventure, Chris Ryan has actually been there. Ryan was a real SAS operative for ten years. He has been involved in many dangerous operations including as the only member of an eight-man team to escape Iraq during the Gulf War, for which he was awarded the Military Medal. He has also trained and selected new recruits for the SAS and is now a bestselling author of teen and adult books. Ryan now travels the world as a security expert, putting all his real-life experience into his books and TV shows.

Chris Ryan books are known for being action-filled adventures packed with twists, adrenaline and intriguing mysteries. The Agent 21 series follows sixteen-year-old Zak Darke who unexpectedly becomes a government agent after being orphaned.

After Zak’s parents die in an unexplained mass murder, he is left completely alone in the world. He is sought out by a mysterious man: all he knows is he works for “a government agency” and that they have their eye on him. They ask him for his help and so Zak becomes Agent 21 and his life changes forever. What happened to the last 20 agents is something he’ll never know…

We follow Zak’s adventures through six gripping books, as the teen discovers that he has nobody to trust but himself. Dealing with terror strikes in London, child soldiers in South Africa and more, Zak’s undercover operations get more and more hair-raising as the stakes get higher. 

This action-packed adventure is perfect for readers aged 12 upwards who love spy books and adventure series, or fans of Alex Rider and Cherub. Zak is the ultimate action hero for young adults and Ryan’s military background adds something gritty and real to these exciting stories. We recommend reading the Agent 21 series in order, starting with book one.


All the Agent 21 books in order:

Book 1: Agent 21 (2011)
Book 2: Agent 21 Reloaded (2012)
Book 3: Agent 21: Codebreaker (2013)
Book 4: Deadfall (2014)
Book 5: Under Cover (2015)
Book 6: Endgame (2016)

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Book 1
Agent 21: Book 1
Book 1

Agent 21: Book 1

Some authors just write about it. Chris Ryan has been there, done it, and lived to tell the tale. Agent 21 is the first ... MoreAgent 21: Book 1

(1 review) 5 1
Review
Book 2
Agent 21: Reloaded: Book 2
Book 2

Agent 21: Reloaded: Book 2

Some authors just write about it. Chris Ryan has been there, done it, and lived to tell the tale. This is the second in ... MoreAgent 21: Reloaded: Book 2

(1 review) 5 1
Review
Book 3
Agent 21: Codebreaker: Book 3
Book 3

Agent 21: Codebreaker: Book 3

Secret agent Zak Darke is back for his third mission - and the stakes have never been higher. An unknown bomber is condu... MoreAgent 21: Codebreaker: Book 3

(1 review) 5 1
Review
Book 4
Deadfall: Agent 21
Book 4

Deadfall: Agent 21

Zak Darke is sent on what seems like a straightforward surveillance op in South Africa but it soon turns into the tough... MoreDeadfall: Agent 21

(1 review) 5 1
Review
Book 5
Under Cover
Book 5

Under Cover

Ricky is a street kid – sharp, quick and usually up to no good. When he tries to steal from the wrong people, he is save... MoreUnder Cover

(3 reviews) 5 3
Review
Book 6
Endgame
Book 6

Endgame

'Don’t come after us … remember the first thing I ever taught you - that your first duty is to stay alive'For some time ... MoreEndgame

(1 review) 5 1
Review
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New Book

Endgame

Endgame

7th April 2016
(1 review) 5 1

Most Popular Book

Under Cover

Under Cover

26th February 2015
(3 reviews) 5 3

Recent Reviews

  • Under Cover

    Under Cover

    by BOLhs-LRC

    I was looking for something a bit different to read and this book was one I had recently bought for the school library.  Its a story of a boy who has ...

  • Endgame

    Endgame

    by Ali

    The last book in the Agent 21 series. I couldn’t wait to read this. It’s absolutely amazing. In this book, Raf and Gabs get captured, leaving it up to...

  • Under Cover

    Under Cover

    by Ali

    This book is awesome. Instead of focusing on Zak, we get introduced to another character called Ricky. It explains how Ricky had no parents, and how h...

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