There are 3 books in the Werepenguin series. The newest book is The Battle of the Werepenguins which came out in 2021.

1
The Curse of the Werepenguin

By Allan Woodrow , Scott Brown (illustrator) ,

Book cover of The Curse of the Werepenguin
But Baron Chordata appears to be a twelve-year-old boy who wears tuxedos all the time, shouts at everyone, and forbids Bolt from asking questions. Things couldn't get any worse... until midnight, when the Baron bites Bolt and turns him into a half boy, half penguin. Then things really couldn't get…
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2
The Revenge of the Werepenguin

By Allan Woodrow , Scott Brown (illustrator) ,

Book cover of The Revenge of the Werepenguin
Following the book Chris Grabenstein called "the most hysterically hilarious book I've read in years," the saga about the evil werepenguins of Brugaria continues!

When we last saw our hero Bolt Waddle, he'd narrowly escaped the clutches of the evil Baron Chordata, but not the fate of becoming a half-boy,…

3
The Battle of the Werepenguins

By Allan Woodrow , Scott Brown (illustrator) ,

Book cover of The Battle of the Werepenguins
In the series Chris Grabenstein called "hysterically hilarious," the saga about the evil werepenguins of Brugaria comes to a stunning, action-packed conclusion!

When Bolt, Annika, and Blackburn are given another cryptic clue by Omneseus the Seer, they know the time has come to defeat the baddest Werepenguin, "the Stranger," and…