The Heath Cousins and the Moonstone Cave

The Heath Cousins and the Moonstone Cave is the first book in the Heath Cousins series.
While visiting their grandfather's 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. The poem leads Addie and her cousins to nearby Moonstone Cave where together they enter a secret and magical garden and embark on an adventure of a lifetime. Along the way, they meet wonderful friends like Gemma, who reminds them all of a younger version of their grandmother; Jumani, a large white wolf; and Jadira, a strange and smelly creature whom they grow to love. During the adventure, they learn the most important lesson of all - they must work together if they want to escape the dangers ahead of them and find their way back home.