December 1585: King Henri III of France is the last of his line. He has appointed a Protestant as his successor, which has caused a three-way war in his country. As a result, the king is in mortal fear of a coup being orchestrated by the ultra-conservative Catholic League. Radical philosopher, ex-monk and spy Giordano Bruno, forced to return to Paris, is called upon by King Henri to unearth the mystery behind several mysterious but linked deaths.