Twelve-year-old Hazel Rothbury stows away aboard the Titanic and, with the help of a porter named Charlie and a first-class passenger named Sylvia, she sets out to explore the great ship, uncovering a haunting mystery--until the ship hits an iceberg and she must fight to save herself and her friends.

When authorities threaten to take Sophie, twelve, from Charles who has been her guardian since she was one and both survived a shipwreck, the pair goes to Paris to try to find Sophie's mother, and they are aided by Matteo and his band of "rooftoppers."

After being taken by German soldiers from a local movie theater along with other Italian boys including his Jewish friend, Roberto is forced to work in Germany, escapes into the Ukrainian winter, before desperately trying to make his way back home to Venice.