"Todo un caballero" would have to fall under the classification of a mystery (a mystery that it even appeared on US cable TV). However, it's a good film, a drama and an RKO Studios remake under the film company name of Ramex. The story comes originally from the 1934 movie "Hat, Coat and Glove" starring Ricardo Cortez, remade again in 1944 with the title of "A Night of Adventure" with Tom Conway. After World War II, RKO became aware of a large audience south of the border, and this became one of their first forays into Mexican film-making. It includes a first-rate cast of Fernando Soler, Malu Gatica and Gustavo Rojo. The story is of a lawyer who defends his female ward's lover in a murder case. Very well told, and suitable for viewing for the whole family. I am prejudiced, but I love the "Golden Age of Mexican Movies" of which this is one.