“An assassination has been ordered, the principal is identified but we do not know the identity of the target and that of the killer (…) You have a limited time to enter inside this building, discover the clues and memorize them. It’s 11 a.m. on Friday, April 21. At the Raid (Research, Assistance, Intervention, Deterrence) training base in Bièvres in Essonne, a group of seven high-level athletes enter a smoky box with hesitant steps.