The Deep

Now both of Sapphy's worlds are threatened. In the profound depths of the ocean, where the Mer cannot go, a monster called the Kraken is stirring. He has the power to sweep Ingo away and shake the land from its foundation.

Because of her mixed blood, Sapphire can enter the Deep. With a great whale as her guide, she will journey to a place so far from the sun, no light can find it—and confront an evil that's even darker.