Unable to accept that Dark Jedi Asaji Ventress is dead, Obi-Wan recruits Anakin's assistance in hunting the Separatist commander. Their journey to their dark destination will be more perilous than either could imagine.

"This volume collects issues #71 through #77 of the Dark Horse comic-book series Star Wars: Republic" "The events in this story begin six months before Revenge of the Sith"

Approximately six months before the events in Revenge of the Sith -- Approximately three weeks before the events in Revenge of the Sith.