Rule No. 2: Don’t go searching for a subject, let your subject find you. You can’t rush inspiration. How do you think Capote came to “In Cold Blood”? It was just an ordinary day when he picked up the paper to read his horoscope, and there it was — fate. Whether it’s a harrowing account of a multiple homicide, a botched Everest expedition or a colorful family of singers trying to escape from Austria when the Nazis invade, you can’t force it. Once your subject finds you, it’s like falling in love. It will be your constant companion. Shadowing you, peeping in your windows, calling you at all hours to leave messages like, “Only you understand me.” Your ideal subject should be like a stalker with limitless resources, living off the inheritance he received after the suspiciously sudden death of his father. He’s in your apartment pawing your stuff when you’re not around, using your toothbrush and cutting out all the really good synonyms from the thesaurus. Don’t be afraid: you have a best seller on your hands.