蒂亚Maggie (Serinda Swan) is a tough and ruthless member of the all-female Dark Moon motorcycle gang led by the merciless Trigga (Pollyanna McIntosh). After Maggie's cousin is attacked and drugged at a party, the gang rides out to take revenge into their own hands. The attackers, led by Keegan (Jake Lockett), don't see the fury coming and a war breaks out with Maggie and Brian (Diego Boneta) caught in the middle as both sides race towards a violent showdown to end it once and for all.