From the author of Pegasus comes a spellbinding first book in a new fantasy series for fans of Rick Riordan and Shannon Messenger following two cousins whose summer vacation gets swept away by a storm that lands them on the lost island of Atlantis.

The last way that Riley Evans wanted to spend summer vacation was stuck on a boat with only her dad, aunt, and bratty cousin Alfie for company. She’s so bored staring at the empty seas of the Bermuda Triangle that they’re starting to play tricks on her eyes, making her see mermaids beneath the waves.

Then a sudden storm washes Riley and Alfie away, leaving them shipwrecked on an uncharted island. When looking for their parents, Riley and Alfie instead find a city beyond their wildest imaginations—the lost city of Atlantis. There are new wonders around each corner in this home of unusual people, mermaids, and unicorns, but also a darkness that lurks in the shadows. As the days pass, Riley and Alfie recover from their ordeal, but the secretive Atlanteans seem reluctant to help them find their parents and return home—they almost seem to be sabotaging their efforts.

The more she learns, the more Riley realizes that the clock is ticking. She and Alfie have to find their way home and soon…before leaving is no longer possible.

Kate O’Hearn was born in Canada, raised in New York City, and has traveled all over the United States. She currently resides in England. Kate is the author of the Pegasus series, the Shadow Dragon series, the Titans series, and the Valkyrie series. Visit her at KateOHearn.com.