As Grawin burns and camps are destroyed in cataclysmic fires, Bushmen Rod, Sam and Ben must use their last dig of the season to secure enough opal for Les' long-awaited retirement. The Blacklighters limp into their final week still without team leader Mark and Paul taking the lead in an opal sale, but some erroneous mental arithmetic costs the boys thousands of dollars. The Misfits defy Opal Joe's orders, dividing forces, until Cody nearly meets his demise down a 10-metre mine shaft. Angel unearths crystal opal in Andamooka's biggest open-cut mine and hopes to trade it for a brand-new house before season's end.