The intrepid reporter and amateur sleuth Joseph Rouletabille becomes involved in the investigation of a hideous crime committed in a room painted yellow, whose door was locked from the inside…
Professor Strangerson
Robert Darzac
Frédéric Larsan
Mathilde Strangerson
Joseph Rouletabille
Jean Sainclair
Daddy Jacques
Mr. Bernier
Mrs. Bernier
Judge Marquet
Mr. Maleine
Mr. Mathieu
Mrs. Mathieu
The Green Man