From a high seas mystery to a life-or-death showdown in the skies .... a white-knuckled new thriller in the NUMA series, from the No. 1 Sunday Times bestselling Grand Master of Adventure, Clive Cussler

A distress call from a Caribbean freighter leads the NUMA crew to an eerie discovery. The captain lies face down in the bridge. Clutched beneath him - an empty shotgun.
Hidden in wait are his shipmates- paranoid, disoriented and ready to fight.
Could it be a mind-altering sickness? Or is something much more sinister?
The crew's tale takes Kurt and Joe to a cadre of Cuban mercenaries, with a plot to use magnificent modern airships to hijack a nuclear submarine. As the mission moves from the seas to the skies, stopping them could be the NUMA crew's toughest task yet...