... that being the central theme of a conspiracy to starve two wealthy children to death to get control of their trust fund.
More than half of the film, though, isn't about this at all, probably because the people involved are either so unlikeable or weak, exactly what are you going to do with the characters involved? It's not like you are going to want to endow them with any humanity, otherwise they wouldn't be able to do what they are doing. Thus about half of the film is about Lora Hart's (Barbara Stanwyck's) quest to become a nurse.
Her roommate during her training is Maloney (Joan Blondell). Lora's character is sincere where Maloney is like most of Blondell's precode roles - cynical and sassy. They can both dish out the precode one liners though. It's hard to think that just 90 years ago the equivalent of a RN could have just three years of high school and some on the job hospital training, but that is the case with Lora Hart.
Along the way during Lora's training, a bootlegger (Ben Lyon) wanders into the hospital with a bullet wound when she is unaccompanied and convinces her to treat him and not report it to the police, which is required by law. As a result this guy becomes her "pal" and that is useful when she needs some help in the second half when nobody will help her with the starving kids because of "professional ethics" that require that doctors and nurses not speak up about the situations that they see, when such ethics can never have meant to just let two kids starve to death.
Ben Lyon seems just a little too good natured to be a criminal who routinely orders people killed. It's also very odd seeing Clark Gable as the brutal chauffeur. Warner Brothers gave him a couple of parts in 1931 - in this one and in "The Finger Points". WB completely overlooked his talent and MGM reaped the rewards from that oversight.
