In the near future, the world is falling apart. A disillusioned highway cop turns vigilante when his young family are slaughtered by a motor cycle gang who refuses to recognise the law.
Make sure to use correct grammar and spelling when you actually submit this to anyone. (I assume you meant “cop” and “vigilante” also young family IS slaughtered) You could leave out that first sentence, and incorporate it into the second. As society falls apart, a disolutioned cop turns vigilante to seek revenge on the futuristic motorcycle gang that slaughtered his family.