A judge, especially one who is incorruptible and fair, is always a target. After all, during his career he has sent more than one criminal to jail. And among them there will always be those who want to take revenge. Judge Mortlake was known to be strict and fair. And he became a target, and was shot point-blank, almost in front of the police. The killer didn’t even have time to take a step before he fell into the hands of the police. And it would seem that everything is very simple. But that was not the case. Three shots, three bullets, three revolvers and one locked room, with one victim and one killer who could have killed the judge. Inspector Page and his superior, Colonel Marquis, must solve the mystery of the “Third Bullet.”