Tides of Floral Dreams (Moonstone Isle #1) by Ashley Adams:
 
On an Isle surrounded by waters of sparkles, lava, caverns, and dangerous mountains lies four kingdoms. Each kingdoms' royals have unique magic, every region representing a specific season and element. At one time these kingdoms lived harmoniously and worked together to strive as they worshipped their gods and gave their people a happy life.

Until one day when the one month old princess of the Coral Cove Kingdom was stolen. The kingdom's trust in one another diminished, but the Coral Cove royals still had an ally in the Bloomhaven Kingdom. Before the lost princess was stolen, a blood oath was given between the Coral Cove princess and the young Bloomhaven prince.

23 years have passed since the lost princess was taken, and the prince looks daily for her.
Then everything changed. A hope was found, a clue unearthed to where the lost princess could be. But the prince no longer wants to find the lost princess. Fate has chosen a different path for him, and he has fallen in love with someone else.

Will the prince break the blood oath? Will the lost princess ever be found? Enter the world of Moonstone Isle, where dreams can turn into nightmares when you least expect them to.