The Thea Sisters are in Canada and have been invited to go bird-watching with a group of friends. But during their trip, one of their group members mysteriously disappears. They set off to Niagara Falls to find him. Can they solve the...

In this exciting adventure, the Thea Sisters are off to Paris to visit Colette's fashion-designer friend Julie. But when Julie's designs are suddenly stolen, the girls must search the city of Paris to catch the thief and save the fashion...