This is the 20th Lone Wolf movie from Columbia out of the 22 they made from 1917 to 1949. The Lone Wolf character is a retired jewel thief played here for the second time by Gerald Mohr. I think he plays well off Eric Blore as Jamison the manservant. At the beginning we see that Lone Wolf and Jamison have just booked into a hotel in Mexico City as they begin their vacation. Jamison is in a mutinous mood as he declares that it will not be a working holiday for him for their fortnight stay. They make a good pair of rogues as it never seems clear by their banter whether their professional relationship is based on crime detection or skulduggery. Eric Blore with his trademark petulant pout steals every scene with his roguish manner. He eyes Mrs Van Weir's rahjput stone pendant with longing as they sit together at a dining table at the El Paseo nightclub. Mrs Van Weir, played in great dowager style by Winifred Harris, is part of the select clientale who indulge in illegal gambling at the rear of the premises. She turns out to be heavily in gambling debts and the nightclub owner has a safe full of jewels that his indebted clientale are giving him to keep their gambling addictions alive. The murder of the roulette wheel croupier and the secret shenanigans of the clientale make for a good lively mystery for the Lone Wolf to investigate.