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The year is 79 A.D. The place is Ostia, the port of Rome. Flavia Gemina, a Roman sea captain's daughter, is about to embark on a thrilling adventure.

In one harrowing day, Viking raiders capture Bree and her brother Devin and take them from their home in Ireland. After the young Viking prince Mikkel sets Devin free on the Irish coast far from home, Bree and Devin embark on separate journeys to courage.

Last week, 12-year-old Sky found a cryptic message from her dad, who mysteriously fled the safety of their underground compound five years ago. The note said the fate of the world depended on her going topside, to a lost world that's ruled by dinosaurs. Today, after a treacherous journey through the wilderness, Sky and her friends have made it to their destination: Lake Michigan.

One hundred and fifty years ago, the first dinosaurs were cloned. Soon after, they replaced humans at the top of the food chain. The only way to survive was to move into underground compounds.... Five years ago, Sky Mundy's father vanished from North Compound without a trace. Now she has just stumbled on a clue that not only suggests his disappearance is just the tip of an even larger mystery but also points directly to the surface. To find her dad - and possibly even save the world - Sky and her best friend, Shawn, must break out of their underground home and venture topside.