Johann Cabal, scientist, skeptic and necromancer, is on the run again, although this time he is being pursued by government agents. Under a false name, he infiltrates the Princess Hortense, a passenger airship bound for another country. Kabal dreams of a quiet journey without any incidents, but the forced idleness and routine have a bad effect on his plans. When one of the passengers dies on board and the circumstances of his death suggest murder, Cabal decides to investigate. A closed space, a limited circle of suspects is a perfect riddle for a bored person with outstanding intelligence. Soon, an assassination attempt is made on the Cabal, and then everything completely spirals out of control. Massive destruction is inevitable, not to mention the resurrected dead.