December 2, 1917
An international organization called the Association for Supernatural Arbitration was founded several years prior to our story to be a liaison between humans and supernatural creatures, but when The Great War begins there was an uproar from both the supernaturals and the privies (people who know about the supernatural) about supernatural warfare. In response, the ASA arranges a secret treaty that requires that supernaturals not be drafted for the war effort.
Our story takes place in 1917 just after America joins the war, and women are taking over the workforce. Charlotte is a detective in the ASA, and Sophie is her roommate who is also a witch in a local coven.