In the 1920s, before Dashiell Hammett went to Hollywood, he reviewed crime fiction for the Saturday Evening Post. This job caused him much consternation. Having spent some years working as a Pinkerton detective, he had some lived knowledge of the world of criminality (which brought some realism to his novels, especially Red Harvest and The Glass Key).

Hammett laid out several rules for crime writers to follow:

• “Not nearly so much can be seen by moonlight as you imagine. This is especially true of colors.”
• “Fingerprints of any value to the police are seldom found on anybody’s skin.”
• “When you are knocked unconscious you do not feel the blow that does it.”
• “When a bullet from a Colt’s .45, or any firearm of approximately the same size and power, hits you, even if not in a fatal spot, it usually knocks you over. It is quite upsetting at any reasonable range.”

Listen to Dashiell, especially regarding how it feels to be hit or shot (“quite upsetting”). Update as needed for technological advances.