“Authentic”, eh? I wonder how often, in any given year, NYPD officers point guns at Vietnam vet cannibals who have just nibbled off the forearm of a buxom young lady (leaving her conveniently cover-worthy)?
The story itself is well-told, if I recall, but deeply unpleasant. DeMille went on to far superior shlock. (“Mayday“, for instance, is proper good stuff.)

