Nick and Katie didn't sign up to go on an adventure. They didn't ask to be nearly killed by a jaguar, or hunt for ingredients under a volcano. They most certainly did not ask to be sacrificed by some crazy high priest at the top of a Mayan temple. But that is just what they got when they volunteered to help pack up boxes in the basement of their grandfather's museum ...well sort of. Grandpa had warned them not to go into the Special Collections room. He had said the room was too dangerous. Nick and Katie probably should have listened. Behind that forbidden door they found a time machine-a...