To Kill A Devil: A Mason Collins Crime Thriller 4

1946 Vienna. When a shadowy organization fails to assassinate Mason Collins, they go after his colleagues, his friends, and the love of his life. Mason knows the only way to stop the killings is to cut off the head of the snake.

Armed only with the alias, Valerius, Mason treks across Franco's Spain to war-torn Vienna to eliminate the man ordering the hits. But tracking him down seems to be an unsurmountable task; everyone speaks his name with awe and fear, but no one knows if he's real or a ...