When a deadly zombie virus infects a school in Germany it remains on the student Leo to save the world.
Eight-years old Kuba is on the trail of a magic stone, which pieces float somewhere in the world. If he puts the pieces together, the magic stone will bring happiness and prosperity to everyone. In search of the magic bits, Kuba and his brother travel through time and space visiting an ancient Gaul pre-Slavic Biskupin.
