Synopsis: S. S. Van Dine's intelligent, insufferable amateur sleuth Philo Vance is the protagonist of The Casino Murder Case. Paul Lukas plays Vance, who is brought to the mansion of a wealthy, eccentric widow (Alison Skipworth) by a mysterious unsigned letter. Several murders are committed in the elderly woman's home, with the evidence pointing to various red herrings before the truth is revealed. Rosalind Russell plays the old lady's secretary (and Vance's object of affections); Eric Blore is Vance's droll valet; and Ted Healy is the obnoxious Sgt. Heath, ever willing to slap the cuffs on the wrong person.