Fiorella and the mystery of the dead bat

Master Guldram of Oybin was killed in Prague Castle. A dead bat is found near his body, and the Inquisition takes an interest in the case. All alchemists are at risk. Rychtář Přibík, meanwhile, is investigating another murder that happened in the city, but it soon turns out that the two crimes are connected. Eventually, Fiorella, together with Martin and Luke, discover the killer, but the problem is how to convict him. Therefore, Fiorella resorts to an alchemical trick to convince even Emperor Rudolf II himself.

The story has a perfect atmosphere of Rudolphine Prague and there is no lack of adventure, detective plot or love.