Two years on from the Four Corners investigation into water theft in the Murray-Darling Basin that sparked a royal commission, the program returns to the river system to investigate new concerns about how the plan to rescue it is being carried out. The river system is the lifeblood of Australian agriculture but right now it's in crisis. It's experiencing one of the worst droughts on record, and with mass fish deaths capturing the headlines and farmers struggling to survive, many are saying the scheme is failing to deliver. On Monday, Four Corners investigates whether the contentious Murray-Darling Basin plan has become a colossal waste of taxpayers' money.