A wide-body jet is nearly lost in the Pacific Ocean; the cause: unknown. Since there was no accident, National Transportation Safety Board (NTSB) management decides against an investigation.
Daniel Tenace, a dedicated NTSB accident investigator, has seen this malfunction before. Acting on his own, he investigates the unusual occurrence against mounting pressures from his superiors. Just as Dan uncovers new problems with the aircraft, a routine passenger flight ends in tragedy on a runway in Memphis; the events leading up to the crash are identical to the near-disaster over the Pacific.
Dan leads the accident probe; relying on years of experience he must determine if the accident was caused by the aircraft, the pilot, or new air traffic technologies that were installed. If he fails, the lives of many and the future of modern aviation could well hang in the balance.