A mystery that caused a rift between families decades ago comes to light when three friends stumble across an old metal box hidden beneath the floor boards in the tree house. Inside the metal box? Hundreds of dollars and a diary. Anna Mae Shetler is a tomboy who's been best friends with Jeremiah and Amos since they were little kids. As they stumble upon this mysterious money, they learn that Anna Mae and Jeremiah's grandmothers used to be best friends... but for as long as Anna Mae can remember they have been cool towards each other. The kids search further and discover that there is a missing third party to this mystery-someone who holds the missing piece to the puzzle. But before they can discover who this mysterious person is, the money disappears again and threatens the friendship of these three friends... Will they be able to figure out where the money is before their friendship is destroyed? And can God mend a friendship that went array decades earlier?