Fifteen-year-old Kat Bishop and her fellow talented teenagers work together to find and steal the "Cleopatra Emerald" from an unscrupulous dealer and return it to its rightful owner, while a former love of her Uncle Eddie tries to get the gem for herself.
A group of teenagers uses their combined talents to re-steal several priceless paintings and save fifteen-year-old Kat Bishop's father, himself an international art thief, from a vengeful collector.
On holiday with Hazel's father, Daisy and Hazel secretly investigate a murder on the Orient Express, rushing to solve it before another murder occurs, or someone else finds the killer.