Lost in an ancient Mayan city. Pursued by criminals. Can you solve 10 riddles and escape?    Nina and Luke are excited to visit their friend Ben in southern Mexico at an archaeological dig. But when they arrive, Ben's nowhere to be found. Clues lead them into the rainforest, where they find themselves in the ruins of a Mayan city.   Ben isn't there by choice. He's been captured by ruthless smugglers, and now so have Nina and Luke! The friends free themselves but to escape the mazelike ruins they must navigate deadly puzzles, traps, and riddles. Can you help them escape? Paperback Book With Flaps; 6 X 8 1/2 inches; 192 pages.