They start chasing a mystery―then it chases them. Twelve-year-old cousins Sophie and Jessica don't have much in common. Sophie loves hiking and her small town. Jessica would rather be shopping in a city....

They must unlock the mystery—before time runs out. Unwrapping a puzzling package and finding a clue launches twelve-year-old cousins Sophie and Jessica into the dangers of The Treasure Key. They're soon...

They start chasing a mystery—then it chases them.Twelve-year-old cousins Sophie and Jessica are solving mysteries in small town Pine Hill. Each book is filled with fun, excitement . . . and a dash of...

Will they find the spy—or will the spy find them first?When twelve-year-old cousins Sophie and Jessica take a class at a chocolate factory, they don't expect to see bad guys in such a sweet place. Strange...