In this final book of The Marinesia Trilogy, Malcolm, Taryn, and Kaileigh, the children of the Prophecy, have one last magical Marinesian Artifact to find-the Deeppearl Ring. Thanks to them, the Seadrop Pendant and the Tidal Bracelet have been secured and the Barrier between Earth and Marinesia is closer than ever to being safely sealed.

But when the children, along with their merfolk friends, Sandy and Pike, discover a new threat from Leviathan, the evil serpent bent on destroying both Earth and Marinesia, finding the Deeppearl Ring becomes all the more important. But where is it? And will they find it before his spy in the Marinesian High Council does?

As Malcolm struggles with changes in his personal life, his growing attraction to Taryn, and the weight of new discoveries that could wipe out both Earth and Marinesia, he must find a way to overcome his challenges, and with the help of his friends, defeat Leviathan once and for all.

The Deeppearl Ring is an action-packed conclusion to the tale of Marinesia about the power of friendship and the importance of doing the right thing, even if it's dangerous.