Even though Nick claims to be retired, the thrill of the unknown and the challenge of solving a puzzle prove irresistible. He's drawn back into the dangerous world he tried to leave behind, showcasing the enduring grip of the detective life. This theme highlights the internal conflict many face when trying to escape their past or resist innate desires.

Nick and Nora's relationship is far from traditional. They are equals who genuinely enjoy each other's company, trading witty banter and engaging in playful teasing. Their partnership extends to the investigation, with Nora actively participating and often pushing Nick out of his comfort zone. This portrays a refreshingly modern take on marriage, particularly for the 1930s.

The novel captures the vibrant energy of New York City during the end of Prohibition. From lavish parties in opulent apartments to dingy speakeasies and clandestine meetings, Hammett paints a vivid picture of a city on the cusp of change. The glamorous facade conceals a seedy underbelly of crime and corruption, adding a layer of realism to the thrilling narrative.