Reduced to begging and thievery in the streets of London, a thirteen-year-old orphan disguises herself as a boy and connives her way onto a British warship set for high sea adventure in search of pirates.

A giant shark escapes from a California aquarium, creating havoc before heading to sea. As he probes the ocean depths in pursuit, biologist Jonas Taylor stumbles on a terrorist nuclear arms factory.

"Ten-year-old Julia loves the mysteries of the ocean and marine biology, just like her scientist mother. Her family is spending the summer on a remote island where her mom is searching for the elusive Greenland shark, a creature that might be older than the trees, and so rare that it's only been seen a few times. But the ocean is reluctant to give up its secrets, and Julia tries not to worry as her mother returns disappointed at the end of each day....