Watch The Frontier (2015) HD Full Movie Free on SolarMovie. Watch The Frontier (2015) online free. Decades ago at The Frontier, a diner with 3 motel rooms in the desert on old route 66, a young woman...Decades ago at The Frontier, a diner with 3 motel rooms in the desert on old route 66, a young woman stops and gets work. She reads about a murder in Flagstaff and a $2M armored truck heist. Is it connected to the people at The Frontier?