During a stay at a school camp, Hector, Fausto and Emilia venture into a cave in Palenque with the firm purpose of scaring Joaquin, a classmate they harass.

However, he disappears and they believe he has died, but he has actually made a journey back in time until the 7th century where he must help ascend to the throne Pacal, who at twelve years old must be the great Mayan emperor.

Meanwhile, their companions begin to receive messages from him and have terrifying apparitions that at first make them fear that this is revenge from beyond. In the end they realize that they are clues to travel back in time to help Joaquin and the Mayan emperor child.

Mystery series for school-age children.