ON A CLEAR, COLD NIGHT HIGH ABOVE EAST ASIA, A CHINA AIR PASSENGER JET DISAPPEARS FROM RADAR WITH ALL ABOARD. IT'S AN ANOMALY, A FLUKE, AN UNSOLVABLE PUZZLE-AND THEN A COUPLE OF HOURS LATER, IT HAPPENS AGAIN. It's 2023. Former Air Force maintenance officer Jason Montgomery and his erstwhile wrench-twister, Rob "Ski" Kalawski, have just landed the gig of their lives. China Air's aging fleet of Boeing 777s now desperately needs navigation hardware...