After the president of an autistic association dies mysteriously, a new corpse is found. Though officially deceased days earlier, he is a suspect.

An armed woman enters the criminal documentation and takes everyone hostage. Accused of killing her godfather to Alcoholics Anonymous, she absolutely wants to prove her innocence. She is desperate, alone against all... Astrid and Raphaëlle, will play the clock and try to piece together the puzzle of this story to restore the truth.

During a prestigious chess tournament, one of the favorite players collapses in the middle of a match, struck down by poison! Astrid and Raphaëlle then realize that they are at the heart of a bloody, life-size game of chess...