The cover of "Murder by Proxy" by Brett Halliday features a woman in a floral dress, with a man's face in the top left corner. The title is in large yellow letters, and the author's name is in smaller white letters. The bottom left corner displays a price of 40 cents. The right side of the cover features a blue background with a photograph of a woman's face and text that reads "AT FOUR O'CLOCK on a Friday afternoon, a tall stacked blonde checked into a plush Miami hotel—alone. Her name was Ellen Harris. Her voice was low and husky. Her walk—an invitation."