Unrequited love is hard enough when youÕre a normal teenage girl, but for Lily Sanderson, thereÕs no such thing as a simple crush.

Lily has a secret, and itÕs not her huge crush on gorgeous swimming god Brody Bennett, who makes her heart beat flipper-fast. LilyÕs mermaid identity is a secret that canÕt get out, since sheÕs not just any mermaidÑsheÕs a Thalassinian princess. When she discovered three years ago that her mother was actually a human, Lily finally realized why she didnÕt feel quite at home in Thalassinia, and sheÕs been going to Seaview High ever since. Living on land has its problemsÑlike her obnoxious biker-boy neighbor, Quince FletcherÑbut it has that one major perk: Brody. The problem is, mermaids arenÕt really the casual dating typeÑwhen they bond, itÕs for life.

When LilyÕs attempt to win BrodyÕs love leads to a tsunami-sized case of mistaken identity, she finds out, quick as a tailfin flick, that happily ever after never sails quite as smoothly as you planned.