What could be more romantic than getting married at sea? Princess Allegra Arrington thinks a shipboard wedding sounds perfect. As the sun sets over the beautiful Sea of Harmony, Allegra and Sam stand in front of their friends and families to pledge their love. But before she can say “I do,” disaster strikes. The wedding ship becomes stuck on course for the treacherous Sea of Discord, and the captain orders everyone to evacuate.
Allegra and Sam and their friends Lilianna and Benji are the last ones aboard a lifeboat. By the time their boat is lowered into the water, it’s too late. They’ve crossed into the Sea of Discord. To Allegra’s horror, a portal opens in front of their lifeboat, and they are sucked in.
When their lifeboat is expelled from the portal, Allegra and her friends find themselves near a strange island shrouded in mist. With two large holes in their boat, they have no choice but to go ashore. When Allegra recognizes the island as one of the Forbidden Islands, she realizes their troubles have only begun.
Seventy-five years ago, the Dark Fairies were imprisoned on the islands. Allegra has no desire to find out if their descendants are holding a grudge. She and her friends need to get off the island before they’re discovered. If they don’t, the four friends might depart the Forbidden Islands, but not in the way they’d hoped.