Heath Cousins and the Moonstone Cave

Addie B. and her cousins Jack, Beanie, and Bodie are mourning the loss of their grandmother Winnie. While visiting their grandfathers beach house in Maine, Addie receives a mysterious treasure box once owned by her grandmother. In it is a moonstone ring and a mysterious poem from her grandmother. The poem leads Addie and her cousins to nearby Moonstone Cave where, together, they enter a secret and...