Paris, July 1999: Private investigator Aimée Leduc is coming home from a long day''s work in St. Germain, where she is investigating a computer security breach at a university, when she is accosted by an acquaintance who once did her a big favor. Suzanne Lesage is a Brigade Criminelle agent on an elite counterterrorism squad who has been working undercover in the former Yugoslavia, hunting down dangerous war criminals for the Hague. Now Suzanne is back in Paris and is convinced she''s being stalked by a ghost—a Serbian warlord responsible for hundreds of murders, a man her team thought they had killed. Her boss thinks she''s just suffering PTSD and has put her on desk duty. Suzanne begs Aimée to investigate—is it possible that Mirko Vladic is in Paris with a blood vendetta?
Aimée already has a lot on her plate—an eight-month-old baby to take care of, a huge case that she needs to prioritize so she can pay her detective agency''s bills. But she can''t say no to Suzanne, who once put her own career on the line to help Aimée crack a case. When Aimée chases a few leads, all evidence confirms Mirko Vladic is dead. It seems that Suzanne is in fact paranoid, perhaps losing her mind—until Suzanne''s team begins to turn up dead in a series of strange tragic accidents. Are they just coincidences? Or is Aimée, too, being stalked by a ghost?