Amy and Lauren Contarino say they believe somebody knows something about what happened to their sister Sally.
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Sally has visited Las Vegas multiple times, drawn to the hiking trails nearby.
During this trip, she failed to board her bus back to Los Angeles and her flight home to Melbourne, despite making plans with friends and family.
Sally was last seen on CCTV at Smith’s Marketplace on June 20, where she purchased protein bars and water.
Her sisters believe she was preparing for one last hike nearby.
Sally left her luggage at her hostel, but she took her passport with her on her walk.
The Nevada Police canine unit tracked her scent some of the way towards the mountain.
Investigators and her family believe someone potentially gave Sally a lift the rest of the way.
“We believe that somebody out there does know something,” Amy said.
Her scent was picked up again on the hiking path but the trail went cold.
“It’s hard to say whether she made it back down and got a lift back into town or not from there,” Amy said.
Investigators and her family would like anybody who drove Sally to come forward.