A socially awkward but very bright 15-year-old girl being raised by a single mom discovers that she is the princess of a small European country because of the recent death of her long-absent father, who, unknown to her, was the crown prince of Genovia. She must make a choice between continuing the life of a San Francisco teen or stepping up to the throne.

Mia Thermopolis is now a college graduate and on her way to Genovia to take up her duties as princess. Accompanied by her friend Lilly, Mia continues her 'princess lessons', like riding horses side-saddle and archery. But her already complicated life is turned upside down once again when she learns that she is to take the crown as queen earlier than expected, all while she meets a mysteriously charming young man.

Upon moving into the run-down Spiderwick Estate with their mother, twin brothers Jared and Simon Grace, along with their sister Mallory, find themselves pulled into an alternate world full of faeries and other creatures.

The coming-of-age story of the Grace Family, as they move from New York to Michigan and into their family's ancestral home. Upon arrival, the family not only uncovers mysteries hidden inside their great grandfather's Spiderwick Estate, but also discovers a secret, fantastical world around them.