Australia. 1970s. The Kelly brothers Andy and Jimmy, both in their twenties, have one great passion: riding big waves. They’ve honed their surfing skills in the sleepy WA town of Margaret River, which hosts some of the world’s most challenging and dangerous waves. Knowing how to shape the perfect board, and encouraged by new friends, the brothers quit their jobs and launch a backyard surf gear business. They rethink traditional design, craft homemade wetsuits and sell their wares out of the back of their van. But their new found success is threatened when Jimmy gets mixed up with a local biker gang.