Balmain's shock defeat of Souths in the 1969 Grand Final has been called the biggest boilover in rugby league history. The true story of the Tigers' upset win has remained untold for almost 50 years, so it has kept its sense of mystery. Until now ... They were coached by Leo Nosworthy, a savvy operator who'd grown up around the Balmain docks. His team was full of character and characters, but lacked big names. The star-studded Rabbitohs were the two-time defending premiers. Famous names such as Provan, Churchill, Beetson and Sattler are prominent in the story. Shady figures linked to organised crime lurk in the background; this was Balmain in the '60s. The relationship between the two clubs had an edge that had simmered for 60 years. Huge sums were bet on the match. Tigers players were accused of faking injury, to slow the game down. The referee's integrity was questioned. It needed a master researcher to comprehend all the intrigue. Ian Heads, the author of many acclaimed sports books, trawled through archives and interviewed a vast range of participants - players, officials, fans and media - to discover what really happened.