In this episode of Philip Marlowe, the tangled web of blackmail, murder, and hidden treasures is unraveled with a twist. Marlowe is drawn into a dangerous game by a dying man's instructions and a mysterious plaid-coated woman, leading him to a phony Russian prince and a seance room full of intrigue. As Marlowe races against time to prevent a deadly rendezvous, he uncovers the truth behind missing pearls, a stolen mermaid, and a dangerous plot that has deadly consequences for those involved. The episode blends mystery and suspense against the backdrop of an atmospheric night in Los Angeles, with Marlowe navigating treacherous relationships and dangerous motives to uncover the truth.