Mud (2013)

Ellis and his best friend Neckbone are a 21st century Huckleberry Finn-style duo. They ride scooters, fish, sail, know every inch of their Arkansas hometown and even find a secret hideaway on an island - a boat stuck atop a tree! But their island idyll and the boat have an inhabitant. His name is Mud. Tattooed, superstitious, disheveled and packing a .45 caliber, Mud tells the boys that he's a fugitive, dodging bounty-hunting assassins. He's also trying to trace his girl Juniper. Mud makes a deal with the two - he offers Neck his .45 in return for food. Intrigued and charmed in equal measure, the boys agree. A grizzled Sam Shephard - a deadshot with a sniper rifle - knows Mud since childhood and warns the kids about him. But Ellis and Neck pay no heed.