The Feather Chase (Crime-Solving Cousins Mysteries, #1)

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. The only mystery is how they ll be able to spend the summer together.
Then they find a briefcase in the forest with a surprise inside. When they hear footsteps behind them and bad guys run after them, they have no choice but to work together to solve the mystery of The Feather Chase.