"Sam can't believe how much her life and luck have changed since she came to Foggy Harbor: First, she discovered that unicorns are real, and now she's on her way to becoming an actual unicorn protector! With her new friend, Tuck, by her side during Uncle Mitch's lessons, Sam finally feels like she's home. But as the long-buried dangers of Unicorn Island begin to surface and a mysterious scourge spreads throughout the herd, Sam learns the truth behind...

"When Sam arrives in Foggy Harbor, population 3,230, all she can see is a small, boring town that's way too far from home. And knowing that she's stuck there all summer with her grumpy Uncle Mitch only makes things worse. But when Sam discovers a hidden trapdoor leading to a room full of strange artifacts, she realizes Foggy Harbor isn't as sleepy as it seems. With the help of a new friend, Sam discovers an extraordinary secret beyond the fog: an...