Reunion — Kara Dalkey

In the second novel of “adventure, magic, and mystery” in the Water trilogy, only land-dwellers can save the undersea world, from the author of Ascension (VOYA).
 
Sixteen-year-old Corwin has found himself a wanted man in fifth-century Wales, thanks to his former mentor, a trickster and thief. Reduced to searching for seashells to peddle, he finds an especially shiny one in the tentacles of a beached sea creature, a shell that will leave a mark on his palm, and in his mind.
 
Plagued by visions all his life, Corwin now sees things with new eyes and senses, including the mysterious girl who comes to his rescue when he is captured by royal guards. Her name is Nia, and she, too, has the mark, and a strange story about an undersea world, an evil mermyd, and a lost prince. They have seven days to find the prince before his poison, now inside them both -- destroys them all -- and their one chance to save the lost city of Atlantis . . .
 
Praise for Ascension
 
“Dalkey's intriguing marine world brims with descriptions of Atlantis and mermyd life.” -- Publishers Weekly
 
“An exotic undersea world is given vivid life . . . A detailed and refreshingly original submerged society, continually revealing deeper layers and hidden crannies that hint at a rich and complex history . . . The exhilarating twists and turns carry readers gasping into a stunning cliffhanger that will leave them clamoring for the next installment.” -- Kirkus Reviews