Nighthawk (NUMA Files #14) - Clive Cussler, Graham Brown

When the most advanced aircraft ever designed vanishes over the South Pacific, NUMA operatives Kurt Austin and Joe Zavala are drawn into a deadly contest to locate the fallen machine. A doomed aircraft Flying over the South Pacific, the most technologically advanced spacecraft ever built vanishes into thin air. Both China and Russia would kill for the secrets it contains. An unstable cargo Kurt Austin and the NUMA team are drawn into a stealthy race to locate the wreck, before someone else does. Only the United States know that waiting in its debris is a payload. A devastating weapon Kept at absolute zero, the cargo could obliterate the face of the earth if allowed to thaw. With only seven days until its temperature rises the NUMA team have to work against the clock to stop its deadly payload from wiping out all of life on earth. ''The Adventure King'' Sunday Express ''Cussler is hard to beat'' Daily Mail