Former jewel thief Michael Lanyard (The Lone Wolf) (Gerald Mohr) along with his butler, Jamison (Eric Blore), go to Mexico on vacation. Lanyard, once a thief has been working as a private investigator. Liliane Dumont (Jacqueline dewit), one of the Lone Wolf's old flames, and Mrs. Van Weir (Winifred Harris) invite Lanyard and Jamison to dinner at Henderson's (John Gallaudet) El Paseo nightclub . They meet Sharon Montgomery (Sheila Ryan), a jeweller's spouse and gambling addict, who has lost a fortune at the casino.