Before Peter became Pan and Alice visited Wonderland, they were siblings living in an idyllic country home with their parents and their older brother, David. In this magical place, they are free to play and let their imaginations run wild as they romp around the nearby forest. However, change is in the air as their priggish aunt, Eleanor, who is extremely critical of how the children are being raised, has arranged for David to attend a prestigious boarding school. As the family strives to accept David’s imminent departure, a deadly accident shatters their wondrous lives. With their family falling apart both emotionally and financially, Alice and Peter decide to find a solution. They travel to London to sell a family heirloom and soon find themselves in a dark, mysterious, and dangerous underworld that propels them on an adventure that will change the course of their lives.