The Odessa File by Frederick Forsyth (The Odessa novels #1)

The suicide of an elderly German Jew explodes into revelation after revelation: a Mafia-like organization called Odessa, a real-life fugitive known at the "Butcher of Riga", a young German journalist turned obsessed avenger...and ultimately, of a ruthless plot to reestablish the worldwide power of SS mass murders and to carry out Hitler's chilling "Final Solution."

Hardcover, 1972

Goodreads: 4.14