Clive Cussler Condor's Fury: The Numa Files

"On a NUMA training mission in the Caribbean, Kurt Austin and Joe Zavala catch a distress call from a nearby freighter. Leaping into action, they locate a damaged vessel and a dead captain. While searching for clues, Kurt and Joe are ambushed by crew members who seem terrified and disoriented. The trawler they were hauling has vanished, taken--the men say--by baffling lights that circled the ship. Kurt and Joe deduce that the men are suffering from Havana Syndrome, which deepens the mystery and raises the stakes. Soon, they're confronting Cuban mercenaries in a life-or-death showdown in the skies"--Provided by publisher.