When Kendra and Seth visit their grandparents for the summer, they discover their home is actually Fablehaven, a secret sanctuary for magical creatures. The siblings must learn the rules of this hidden world, where fairies, satyrs, and other beings exist, but breaking the rules can unleash dangerous consequences. Their summer turns into an adventure of survival and bravery when a powerful artifact is stolen, threatening to destroy the preserve and unleash darkness upon the world. Kendra and Seth must work together, using their unique strengths, to save their family and the magical creatures they've grown to care about.