Matt Rendell: Olympic Gangster.
It's a biog of the French cyclist Jose Beyaert who rode 2 TdFs in the 1950s and won the gold medal at the 1948 London Olympics.
Aside from the that he was also a gymnast, a boxer and an arms trafficker during the Second World War, but ended up in Colombia to inaugurate a new velodrome in Bogota in 1951, promptly winning the Tour of Colombia in 1952. He liked it so much that he stayed in Colombia, intially as a cycling coach, but later variously as a businessman, restauranteur, hair dresser and hair product salesman, balsa wood logger, flight attendant, emerald-trader, and (possibly) a hired killer for the Colombian mob. He eventually left Colombia in the 90s, as the narcoguerillas got into kidnapping retired cyclists, and moved back to France.
All his life he seems to have liked a good fist-fight and once threatened to break Fignon's jaw - Fignon having made some derogatory comments about Colombian riders.