"Under the sea, a crab follows its heart and its calling, bringing everyone together in the wake of a disaster"--

The Cahills are the world's most powerful family, but their strength is being tested. A sinister man calling himself The Outcast has targeted the family and set them an impossible test. He's recreating four of history's worst disasters and challenging the young Cahills to find and stop the tragedies before it's too late. Now, with one disaster behind them, siblings Dan and Amy Cahill and their friends have just days to discover what the Outcast's...

"Mount Vesuvius is ready to erupt, threatening to destroy the city of Pompeii and everyone who lives there. Will new friends Thalia and Felix be able to escape, or are they destined to be buried under rock and ash? Thalia is excited to visit the bustling city of Pompeii, while Felix longs to leave it. As Thalia prepares to perform with her traveling troupe of actors, Felix is searching for a life of adventure away from his strict, politician father....

For twins Jo Jo and Sophie Dupre, Hurricane Katrina isn't the most important thing on their minds-not compared their mother's cancer treatments, Sophie's swim meet, and Jo Jo's upcoming coding competition. But when the storm intensifies and there's only one seat their aunt's car, Mom has to be the one to evacuate. The twins and their father are stuck at home in the Lower Ninth Ward of New Orleans.