Deep in a mystical wood, four clans of boys live in the treetops, their story lost in time and their pasts buried with it. Secrets hide among the shadows of a crocodile-infested river, winding through the heart of the forest and beckoning to explore what lies beyond. Leonardo is a member of Raven Clan, the boldest and fiercest of the four groups, led by his ruthless older brother Aleksander. When clan hostilities build, Aleksander sends Leonardo on the river to defend Raven territory. Leonardo quickly learns that nothing is as it seems, and a series of inexplicable events-including the appearance of a ghostly lion and a mysterious Native girl, who calls Leonardo and his friends 'Lost Boys'-leads him to question everything he's ever known about the woods he calls home. As the hostilities erupt into a fully-fledged war, Leonardo is forced to choose between loyalty and instinct; a choice that will seal the fate of Raven Clan and everyone he cares about.