The Dalton Sisters are dedicated theatre-goers. They go over and over to the same shows, and even cut back on lunch so they can afford tickets. “Their favourite show by far is ‘Les Miserables’. The Dalton sisters have seen Les Mis more than 500 times. They’ve travelled overseas and interstate to see it, paying $60,000 for the pleasure, watch every performance intently, know all the lines, and notice if they’re delivered differently. Joanne still cries at every session.” A fascinated documentary-maker has made a film of their obsession…