Captain of Fates (Twin crowns Book 4), Katherine Webber

Someone is making waves … Captain Marino Pegasi.

Wedded to the sea. Immune to love. Until now … Captain Marino Pegasi is never happier than when he’s exploring the oceans.

But when his beloved sister, Celeste, falls gravely ill, he is forced to go on a desperate search for a cure. Little does he know that in his search he will find so much more lying beyond the horizon. Does Marino’s fate truly lie in the hands of a bewitching, mysterious mermaid …?