Secret Of Flight X-71

<p>Sabotage! Kidnapping! Mystery!</p><p></p><p>In the middle of a summer aeronautics class at the Bayport Airfield Frank and Joe witness a dangerous plane crash. But after they help rescue the plane's passengers the real mystery begins. Not only is the plane a technical marvel but its crew and cargo are keeping secrets as well. </p><p></p><p>Who are the passengers of this experimental jet? And why does someone want them out of the picture for good? A kidnapping and series of deadly traps mean Frank and Joe must form an alliance with strangers and discover who is behind these attacks before it's too late!</p><p><br></p>