Ever since she was little, Alice has liked to collect things. Feathers, leaves, wood pieces... But what she prefers, it's her seed collection! One day, while she's planting them to watch them grow, she hears a funny whisper... the whisper of the forest! Alice wants to help, so she convinces her schoolmates to go on a crazy adventure: grow an urban forest in the schoolyard!
Through the pages, the months, and the years, we see Alice's forest growing, welcoming new inhabitants... and the whisper of the forest is slowly spreading.