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Detective Philo Vance (Paul Lukas) gets an anonymous letter threatening wealthy Lynn Llewellyn (Donald Cook) if he visits his Uncle Kinkaid's casino. Vance meets with the bickering family, including Lynn and his wife, as well as secretary Doris Reed (Rosalind Russell), who offers to assist him. The visit proceeds, and despite police protection, Lynn collapses at the gambling tables. Soon after, his wife is found poisoned, complicating Vance's attempt to unravel the Llewellyns' dark secrets. Wikipedia