There are 2 books in the Wintervale series. The newest book is The Winter King which came out in 2021.

1
The Crow King

Book cover of The Crow King
Magic is against the law. Will Gwyn risk execution to save his brother?
The Crow King has outlawed magic. Despite the kingdom's edict, Gwyn plunges into the ancient and deadly True Wood to find a magical cure for his dying brother. Within the shadowed realm, he must fend off more…
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2
The Winter King

Book cover of The Winter King
Magic is waking. War has begun. Down with the king.

Fifteen months ago, Gwyn discovered he’s the rightful king of Simaerin, last of the ancient line of Wintervale. Now he leads an army against the tyrannical Crow King.

But first, Gwyn and his ragged army of tradesmen, peasants, and escaped…