1572. Edward Hunter undertakes a mission to discover the source of Catholic propaganda smuggled into England. In Paris, full of tension between religious civil wars, he finds an informant murdered, an ambassador threatened with assassination, and seductive femmes fatales. As if these challenges are not enough, his lover wakes him on Saint Bartholomew's Day shouting that the Catholics of Paris are killing their Protestant neighbors. Since Catholics believe he is a Protestant and Protestants believe he is a Catholic, can he survive?