Who's Killing All the Gringos? - David Leroy Nelson

Investigator Juan Maria Leon Saavedra takes charge when bizarre murders disturb Paraguayan tranquility. The victims are foreigners with secrets to hide. Operating out of the exotic Center of old Asuncion, Juan uses the philosophy of Augustine of Hippo to solve crimes and to guide his own life. Juan has never fully recovered from the hit-and-run death of his beloved wife Teresa. As Juan confronts the gringo murders, he relies increasingly on the resourceful and lovely policewoman Sara Diaz. Sara also has a secret past. The uniquely Paraguayan scene includes police commissioners, revolutionaries, indigenes, priests, doctors, businessmen, prostitutes, playboys, and foreigners, all of whom compete in a war of good versus evil."