The story begins in two worlds: the real world and the magical Archipelago, a cluster of islands hidden from humans where mythical creatures like griffins, unicorns, and manticores live. The Archipelago thrives on magical energy known as glimourie but this energy is fading and the creatures are dying. The protagonist, Christopher, is an ordinary boy living in Scotland who has an extraordinary connection with animals. He attracts them wherever he goes, something his father finds deeply unsettling. Meanwhile, in the Archipelago, we meet Mal, a young girl who can fly when the wind blows and has a unique bond with the magical creatures.
The adventure begins when Christopher is sent to live with his grandfather, Frank Aureate, in the Scottish Highlands. Frank lives near a forbidden hill, and despite being warned, Christopher climbs it and discovers a hidden lake where he saves a baby griffin from drowning. The rescue of the griffin, named Pip, marks the beginning of his entanglement with the Archipelago. Meanwhile, Mal’s world in the Archipelago faces increasing danger. The soil in her forest is turning gray and the creatures such as griffins are becoming extinct. Mal is warned that she is deeply connected to these events.
Soon, Christopher discovers that his grandfather is a Guardian, one of the protectors of the Archipelago. Frank reveals that the Archipelago is the last refuge of mythical creatures hidden from humans to protect them. The dark forces threaten the existence of both the Archipelago and the real world.
Christopher and Mal’s fates collide when Christopher is transported to the Archipelago where he meets Mal. Their journey takes them through the maze, a treacherous path that no mortal has ever survived. Along the way, they encounter various mythical creatures, including dragons, manticores, and unicorns. One of their most dangerous encounters is with a manticore that nearly kills them, but they escape with the help of a small dragon named Jacques.
Their journey leads them to the glimourie tree, which is dying because of dark forces in the Archipelago. They learn that the Archipelago’s magical creatures are tied to the health of the glimourie. A villain named Kavil who seeks to control the glimourie for his power pursues them.
As Christopher and Mal travel deeper into the Archipelago, they encounter betrayal from those they trust. Christopher must also confront the reality that their quest may be impossible to complete without sacrifice. In a climactic battle, Kavil captures Mal believing that she holds the key to controlling the glimourie. Christopher, with the help of Pip and other magical creatures, launches a daring rescue.
In an act of profound love and bravery, Mal flies into the sky, merging with the glimourie and disappearing into a burst of light. Her sacrifice restores the glimourie, which saves the magical creatures and the Archipelago.
Christopher, heartbroken by Mal’s sacrifice, returns to his world. He is forever changed by the adventure and the loss of his friend. Frank, proud of his grandson’s bravery, reassures him that Mal’s spirit will live on in the Archipelago.