As a Trade editor for more than 30 years, Tam Mossman contracted several best-sellers and rejected thousands of failed manuscripts. Here, he pinpoints the "essential vitamins" that help some books enjoy huge successes - and why most, lacking these must-haves, soon go out of print. A bonus Strategy (#7.625) explains how editors decide which submissions to sign, while Amazon.com's reader reviews and handheld devices like Kindle let buyers - not publishers - choose what they want to read.