Ethan Gage is rushing to rescue "Egyptian priestess" Astiza and son Harry from imprisonment by a ruthless mystic who seeks revenge for disfigurement, and an evil dwarf alchemist who experiments with the occult on Prague's Golden Lane. Using death as his ruse, along with a pair of unlikely allies --- a Jewish Napoleonic soldier and his sutler father --- Ethan must decipher clues while Astiza uses her own research to concoct an explosive escape and find a lost tomb.