Las ruinas perdidas (Amanda Black - Escape Book)

It all began with rising rivers and beaches swept away by the sea. That was when Aunt Paula suspected something was wrong with the Ring of Tides, a powerful artifact that protects the world from tsunamis and floods. Legend has it that the ring lies hidden in an underground world, within the ruins of a forgotten civilization. There is little time left before everything is washed away by the water! To prevent this, I must enter the Hollow Earth and find a way to reactivate the Ring of Tides before it is too late.