When the planet prison Kiffex is subjected to a staggering attack, of unknown origin, it is the Chevalier Quinlan Vos that the Jedi Council decides to appeal. Despite a resolutely hostile environment, Yours manages to climb the track: a black Jedi, who controls vampiric creatures, is at the open. Before even facing it, however, he will have to face two other threats. His Padawan Aayla Secura, whose mind has been manipulated, wants the death of his master. But the worst enemy of Quinlan Vos resides in himself, in this part of his soul that suffers the attraction of the dark side of the Force. This adventure lies between Episodes I and II of the Star Wars chronology.