In Betwixt and Between,Ian and Zeke fought a battle against the queen of the dark realm in order to be together. Now, just when they think they might settle into as normal a life as elves living among humans might be able to expect, a new enemy threatens to tear them apart. While Zeke helps the shaman Alistair in his hunt for an elusive mermaid, Ian is called to confront a wicked nymph preying on tourists along Seattle's waterfront. Zeke and Ian soon discover that the defeated Queen Ysolde has spread her evil into the sea realms, and danger lurks beneath every wave. But it's too late to stop an escalating series of confrontations that lead to disappearances, death and the possible end of light in this world. As Ysolde plots revenge and a mysterious prince seeks to win Ian for himself, the ancient war between light and dark sweeps Ian and Zeke into its maelstrom of hate, testing their trust for each other to the utmost.