Sherlock Holmes unexpectedly extends his stay in Florence as he has been tasked with solving the burglary at a collector's home. The perpetrator, who dismissed the extremely valuable Renaissance paintings, attempted to steal the enormous group portrait by contemporary painter Adriano Benetti from Livorno, which depicts five members of an esoteric club called Nuovo Circolo del Fuoco d'Inferno. What began as a somewhat unremarkable routine case takes on a whole new urgency when the artist Adriano Benetti dies in a tragic accident before Holmes can speak with him. The English master detective doubts that Benetti truly fell victim to an accident, especially since the painter was having an affair with Lady Epperstone, the widow of Sir Epperstone, the commissioner of the ominous group portrait. Holmes finds, once again supported by.