August 1939. German tanks roar into Poland to start World War II. Just before the army invades, Halina discovers plans for a device that can help win the war. A thousand miles away, Charles spends his days on a fishing boat in the middle of the English Channel, unaware that Halina's fate and his will soon be joined together. Sit in Miss Castillo's class at Clarendon Junior High as she tells their story and unlocks the mystery of the enigma machine.