The Foundation for Supernatural Activity, led by the Board of Overseers, is the reason why no one really believes in the boogieman anymore. Knowingly or not, every world government has given them full power to deal with the supernatural. Their operatives in the field are the Grey Coat Hunters. Powerful, skilled, well-equipped and lacking any pesky morals, the Hunters are the perfect weapons against what goes bump in the night. So when two of the best get assigned the task of bringing in twin teenaged Artifacts to be trained into their ranks, at least it's an easy assignment, right?