"Mateo, Ruby, and Corey Hudson have lost their friend Jia to the villainous Captain Vincent's clutches, and now they're determined to bring her back to safety. But the Hudson kids don't have a way to time-travel without the Obsidian Compass, until Mateo figures out the secret component to get his own homemade compass working. Soon the whole family--plus their wacky neighbor, Chuck, and his rusty orange bus, Blossom--are swept up in another epic adventure. With their own time-traveling vehicle and some help from history's most famous young markswoman, Annie Oakley, the Hudsons think they're prepared to sneak onto the Vermillion. Unbeknownst to them, Captain Vincent already knows they're coming. In fact, he's counting on it..."--Provided by publisher.