In this episode of Philip Marlowe, Marlowe is enlisted to investigate why a woman named Ona Estabrook was seen on a boat in Mexico, despite her fear of them. As Marlowe delves into the mystery, he uncovers a web of blackmail, murder, and smuggling involving a man posing as someone else, a captain of the customs department, and a group of dangerous individuals. With twists and turns, Marlowe navigates a treacherous path to uncover the truth and bring justice to those involved in the tangled web of deceit.