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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 time machine cleverly disguised as a stone obelisk. As soon as they touched it, they are whisked back to the time of ancient Maya. Now Nick and Katie need to solve the mystery of how to get home or they just might be stuck in a time without electronics and indoor plumbing forever!

Nick and Katie found a time machine in the basement of their grandfather's museum. Before they even know where they've traveled, Nick and Katie are chased through a castle, arrested for stealing, and thrown in a dungeon. Surrounded by darkness, rats, and filthy peasants, they hear talk of a name they thought was only found in storybooks … Robin Hood. Will Nick and Katie find a way back home, or will they remain prisoners to the infamous Sherriff of Nottingham?