Martin and his friends are helping their parents turn an old Brazilian coffee plantation into an inn. The children have a fun time helping to renovate the old place and they sleep in a shed that is being converted into a guest room. But one night they hear the sound of a young girl crying. Gradually, the ghost of a slave girl from the late 1800s named Rosario appears to them. Rosario tells them the story of her life and in doing so reveals the danger...