A woman without stories is found dead on a bench in a park, victim of a sting poisoned by the venom of an exotic snake. Astrid and Raphaëlle embark on the case and soon find themselves on the trail of a dangerous mafia hitman who had not been talked about for years. Why did he come out of the shadows again? Did this woman die by accident or was she involved in illegal activities? The two investigators have a hard time to get the truth out in the open. As always, Astrid's extraordinary sagacity is of great help to Raphaëlle...