During World War II, both sides communicated extensively through telegraph messages. If it weren't for a brilliant team of U.S. codebreakers, the allies might not have won the war. Your mission is to join this top-notch team and crack top-secret codes of the Germans and Japanese. It is the year 1941. You have travelled back in time to world War II. You are standing on the deck of an American battleship in Pearl Harbor, when you suddenly hear the drone of attacking Japanese bombers. You watch helplessly as the planes swoop down and a terrifying black torpedo comes whistling towards you. You need to discover if anyone could have known about the attack in advance. Was there any way the devastation could have been prevented? In this book your mission is to discover how the breaking of enemy codes helped the Allies win. You will travel all over the globe, braving battles and facing constant peril of a world at war. Are you ready to face the danger? The Time Machine series challenges young readers to use their imagination and decision-making skills to write their own story. Options in the text allow readers to choose any path they like within the plot. Readers must draw on background information about the period to make the right choices. This makes the series a great educational device for youngsters to learn about history and all the different cultures, events, and periods that shaped it. Peter Lerangis is the author of The Watchers science fiction series published by Scholoastic and The 39 Clues. He has also written several young adult novels such as Attack of the Killer Potatoes, It Came from the Cafeteria, and The Yearbook.