There are 3 books in the The Covenant of Muirwood series. The newest book is The Void of Muirwood which came out in 2015.

1
The Banished of Muirwood

Book cover of The Banished of Muirwood
In a world full of magic and mystery, eighteen-year-old Maia is the exiled princess of Comoros and rightful heir to the throne. Forced to live as a servant in her enemy's home, Maia flees her captors and begins a perilous quest to save her people. To survive, she must use…
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2
The Ciphers of Muirwood

Book cover of The Ciphers of Muirwood
From the moment she was banished by her father, the king, Princess Maia journeyed to seek sanctuary at Muirwood Abbey, the epicenter of magic and good in the land. Now safe for the first time since her cruel abandonment, Maia must foster uneasy friendships with other girls training to be…

3
The Void of Muirwood

Book cover of The Void of Muirwood
When banished Princess Maia is captured by her father and threatened with execution, it appears that all is lost...until the people rise in rebellion against their king. Suddenly, the cast-aside royal finds herself crowned the first Queen of Comoros. But enemies appear on all sides as her father's conniving supporters…