Since The Bleed happened about seven years ago, things have not been the same. All over the world, passages opened between our world and a nightmarish mirror reality; one where monsters actually lurk in the shadows, between the trees, and under our children's beds. How it actually happened is uncertain, but a joint effort from the governments of the world managed to close the passages and official agencies have more or less control over where these passages are inside their jurisdiction. However, leaks are constantly happening.
In America, the Department of Shadow Defense is the agency charged with cleaning up and keeping the population safe. This is where you come in. Usually, DSD analysts map the problem and assign crews to do their part. The characters' job is to clean up - kill, capture, or destroy - the creatures in question.
Characters work as a low-level cleaner crew out of a DSD facility in Bangor, Maine. Their particular crew have the means, skills, and resources to deal with creatures who can be physically damaged or destroyed without the need for ritual or ethereal power.