Welcome to the Salt Mine, a black ops agency that monitors and manages supernatural activity from its subterranean headquarters in the deep mineral mines of Detroit, Michigan. When magic is real, someone has to keep it in check.
A butterfly-covered body is discovered in Los Angeles and Agent David Wilson—codename Fulcrum—is tasked with investigating the strange occurrence. The last time "butterfly deaths" occurred was more than sixty years ago, and if this recent death holds to form, more are on the way. Can Fulcrum finally net the Butterfly Killer?