"Mysterious mist horses have come to Pixie Hollow. Kate befriends one, but Silvermist finds an old legend that says they might be dangerous"--

When a deadly disease breaks out, it is up to Anthea and her friends in the Horse Brigade to transport medicine throughout the kingdom while avoiding Anthea's evil mother and uncovering a powerful secret.

"Willa Dunlap and her younger brother, Ben, are new to Chincoteague Island. Their parents are busy planning the opening of a bed-and-breakfast, which gives the kids plenty of time to explore. But with so many new people and places to get used to, Willa worries Chincoteague will never, ever feel like home."

Even though Ben is allowed to ride and groom his sister's pony, Starbuck, everyone knows Starbuck is really Willa's pony: the two are inseparable, as close as a girl and pony can be. But then the kids discover a wild, renegade pony plucking apples from a tree. Ben names the pony Winesap, but Willa doesn't want her brother to grow too attached, as she's sure they'll find his original owners and Ben will be heartbroken when he's returned. But it's too...