Review by greenbudgie

Henry Carson is found dead slumped over his desk in the library. Because of the slightness of the wound and the lack of bleeding there is a mystery about the way he has been murdered. Henry had been a curmudgeon and it's only his brother Charles who shows any real signs of grief over his death. And he seems to be concerned that he may be next to die in such a way.

There are two investigators on the case. The old experienced hand who is actually retired and the young one who shows how green he is or at least that's how the elder one thinks of him. Both have an interest in the Carson household chiefly through their associations with Elsa who is heir and niece to the Carson brothers. Landis the younger investigator is engaged to her. The older investigator Bernard has also an interest in George Carson and his new butler Foot as he has been investigating them both for years.

I don't think I've ever been confronted by so many clues as I was in this whodunit. It was puzzling when trying to piece all of them together into one cohesive idea of how and why the murders were committed. The suspects include a chemist who is experimenting on poison gas and an intruder who turns out to have a pathetic tale to tell and just about everybody else in the story. There is an impression that some characters are covering up for other characters. And there is an air of a slightly unusual grayness to the humor and the ending is certainly unconventional.