The race for thirty-nine keys, which should bring world power to their owner, is coming to an end. The latest clue leads 14-year-old Amy and her younger brother Dan, as well as their many rivals, to the small town of Stratford-upon-Avon, home of the great bard, William Shakespeare. Here they have to solve the last riddle - and find out what the secret of the thirty-nine keys is and what prize the winner of this cruel race should receive. However, faced with the final test, the children doubt whether the result is worth all the sacrifices that must be made for it.