Paul Christopher - The Valley of the Templars (Templar #7)

Retired Army Ranger John Holliday and his friend Eddie travel to Cuba in search of Eddie’s mysteriously vanished brother—and find themselves desperately trying to stop a shocking plot of a secret Templar cabal that has been growing for five hundred years. As the conspiracy tightens the corrupt and dying Castro regime in an iron grip, Holliday must find Eddie’s brother before it is too late...and the secret horror of what lies in the Valley of Death is revealed.