Pedro lives in the village called Marbleville, where his father works in the marble mine. In the mine, men carefully dig rocks, which when opened contain coloured marbles. The miners are allowed to take home two rocks for their children to open.
One day, when Pedro opens rocks his father has brought home they reveal marbles unlike any Pedro has seen before. The marbles have beautiful stripes in them.
When Pedro shows them to his grandparents who are visiting, his grandmother decides it is time to open some envelopes entrusted to her many years ago by the mother of the present mine owner.
The opening of the envelopes takes the whole family and a few of Pedro's friends on a magical journey into the past, to rescue villagers who mysteriously disappeared many years before.
They are helped by two friends namely a bird with three feet and a talking doll.
