Private investigator Aimee Leduc is coming home from a long day's work when she is accosted by an acquaintance who once did her a big favour. Suzanne Lesage is an agent on an elite counterterrorism squad who has been working undercover in the former Yugoslavia, hunting down war criminals. Now Suzanne is back in Paris and is convinced she's being stalked by a Serbian warlord responsible for hundreds of murders - a man who's meant to be dead. Her boss thinks she's just suffering PTSD but Suzanne begs Aimee to investigate - is it possible this dangerous man is in Paris with a blood vendetta?