Patricia A. McKillip 
Something Rich and Strange [EPUB ebook] 

They have lived among us for centuries-distant, separate, just out of sight. They fill our myths, our legends, and the stories we tell our children in the dark of night. They come from the air, from water, from earth, and from fire. What are these creatures that enjoin out imagination? Faeries.Megan is an artist who draws seascapes. Jonah owns a shop devoted to treasures from the deep. Their lives, so strongly touched by the ocean, become forever intertwined when enchanting people of the sea lure them further into the underwater world-and away from each other.