There are 3 books in the The Wilderking Trilogy series. The newest book is The Way of the Wilderking which came out in 2006.

1
The Bark of the Bog Owl

Book cover of The Bark of the Bog Owl
Courage and a heart for adventure drive twelve-year-old shepherd boy Aidan Errolson. When the bark of the bog owl echoes from the forest across his father’s well-tended pastures, Aidan dreams of wild places still untamed and quests not yet pursued.

Aidan’s life changes forever on the day Bayard the Truthspeaker…
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2
The Secret of the Swamp King

Book cover of The Secret of the Swamp King
As book two opens, Aidan is living in the court of King Darrow. He has become best friends with Darrow's son Steren, and he enjoys great favor among the courtiers. But King Darrow's suspicion is growing and his insecurity causes him to hate the young man who saved his kingdom.…

3
The Way of the Wilderking

Book cover of The Way of the Wilderking
n book three of the acclaimed Wilderking Trilogy, civilizer Aidan returns home from three years in Feechiefen Swamp to discover that a party known as the Aidanites has arisen among his fellow Corenwalders. They believe the “Wilderking Chant” makes reference to Aidan, and that he is destined to overthrow Corenwald's…