The Musketeers of Haven a Science Fiction Story

Earth's one and only off-world settlement, dedicated to non-violence, equality, toleration, balanced development, and all politically correct good things has been overrun by sword and spear-wielding creatures. As the authority overseeing the development refuses to acknowledge the problem or even tell Earth's governments, the authority director shanghais a reservist soldier along with a rag-tag group of ex-cons to fight the creatures. But what can this tiny band do given that the colony has no weapons and what about the settlement's young people, sent away by their parents to a summer camp? Then there are the mysterious creatures who live in an equally mysterious structure who want to be left alone. The answer, the humans realise, lies in rediscovering Earth's violent past.