There are 3 books in the Wildwood Chronicles series. The newest book is Wildwood Imperium which came out in 2014.

1
Wildwood

By Colin Meloy , Carson Ellis (illustrator) ,

Book cover of Wildwood
When her baby brother is kidnapped by crows, Prue McKeel begins an adventure that will take her and her friend Curtis way beyond her hometown and deep into the Impassable Wilderness. There they uncover a secret world in the midst of violent upheaval, a world full of warring creatures, peace-loving…
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2
Under Wildwood

By Colin Meloy , Carson Ellis (illustrator) ,

Book cover of Under Wildwood

Ever since Prue McKeel rescued her brother from the wicked Dowager Governess and returned home from the Impassable Wilderness, life has been pretty dull. But when dark assassins, a dangerous businessman and a freezing winter all threaten the residents of Wildwood, Prue is drawn back in to their world. Together,…

3
Wildwood Imperium

By Colin Meloy , Carson Ellis (illustrator) ,

Book cover of Wildwood Imperium

A young girl's midnight seance awakens a long-slumbering malevolent spirit . . .

A band of runaway orphans allies with an underground collective of saboteurs and plans a daring rescue of their friends, imprisoned in the belly of an industrial wasteland . . .

Two old friends draw closer to…