When he went to see his wealthy client Philip Vantine he did not expect to to witness a gruesome murder that was the beginning of a series of mysterious events. How was the victim killed, all alone in a room with doors and windows closed? Who is the shadowy criminal mastermind? And what is the mystery of the Boulé Cabinet? This thrilling murder and detective novel comes with footnotes by the translator explaining new and unusual terms as well as a glossary of difficult words.