There are 6 books in the Beyond the Four Kingdoms series. The newest book is A Princess of Wind and Wave which came out in 2019.

When Princess Liliana and her twin sister set sail for new lands, Lily hopes to find adventure and romance. But the people of Marin live under the shadow of a curse—one powerful enough to destroy entire kingdoms. To protect them all, Lily and eleven other princesses are forced to participate…
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2
A Tale of Beauty and Beast

Book cover of A Tale of Beauty and Beast
Princess Sophia has helped her twin sister Lily save the duchy of Marin. But now Sophie faces an even greater threat when she sets out to free the cursed kingdom of Palinar from its beastly prince. Alone, and with danger on every side, Sophie must navigate a magical castle and…

3
A Crown of Snow and Ice

Book cover of A Crown of Snow and Ice
An unexpected gift from her godmother will give Celine enough fire to take on an entire kingdom of snow and ice. But first she needs to melt one frozen prince. Rumors have long swirled about the strange kingdom of Eldon. The only thing more frozen than its mountains are the…

4
A Dream of Ebony and White

Book cover of A Dream of Ebony and White
Snow has always lived under the shadow of her cruel stepmother, with only her beloved father and her childhood friend--the huntsman, Alexander--to make life bearable. When her father dies, she should be crowned queen, but instead she finds herself fleeing for her life. With no allies, no skills, and no…

5
A Captive of Wing and Feather

Book cover of A Captive of Wing and Feather
Princess Adelaide has been missing for years. And that’s exactly the way she wants it. Haunted by her past, not even the curse that entraps her is enough to make her long for her old home.
But her past finds her anyway, in the form of a handsome prince from…