When you think of a great twist or a red herring or a way of misdirecting the reader, it is good, but you know that they are just tricks at the end of the day, and the way to keep interest is to write characters that people care about.
When a crime writer thinks up a delicious twist, it is a great moment. Time to relax and take the rest of the day off. I do think that it can be overdone, however.
I'm a city boy. I grew up in a big city, in Birmingham, and I want to write about a city. It's much richer tapestry for me than green fields. Fields and wild life make me feel ill. I don't like - I don't want to write about that stuff.
I've always slightly preferred Spade to Marlowe, probably just because I thought Hammett was cooler than Chandler. He was leftwing, his name shortened to Dash rather than Ray, and he didn't smoke a pipe or like cats.
As a writer, you're making a pact with the reader; you're saying, 'Look, I know and you know that if this book was really a murder investigation, it would be a thousand pages long and would be very dull, and you would be very unhappy with the ending.'
Whenever people ask where I get my sick and twisted ideas from, I reply, 'Just open your eyes.'