Le Mystère de la Chambre Jaune

What is Le Mystère de la Chambre Jaune about (plot, summary)
Jo, a young journalist, is shocked to learn that an attempted murder has taken place in her native village of L'Artuby, nestled in the Verdon Gorge. She is devastated to discover that the victim is none other than Mathilde—a close childhood friend—who has been in a coma since the attack. The circumstances of the incident are particularly intriguing: when villagers, alerted by screams, managed to enter the victim's room, she was alone inside.