After the Axis Institute is blown up, fifteen-year-old Cadell Piggot is unhappily stuck in foster care with constant police surveillance to protect him from the evil Prosper English until he gets an offer to join a mysterious group called Genius Squad.

With help from their cousin Harry, eight-year-old twins Ella and Ethan discover who is illegally taking coral from the reefs near their aunt and uncle's beach house on the shore of Australia's Coral Sea.

When thirteen-year-old Gerald finds himself the heir to twenty billion pounds from an aunt he never met, he inherits with it a mystery surrounding his aunt's death and various artifacts in the British Museum.