James Patterson’s latest best seller, The Angel Experiment, is a little different from his usual hits. The novel isn’t new; it came out four years ago. Readers aren’t picking it up at bookstores, but mostly on the Kindle site at Amazon.com. The price is low, even for an old release: $0.00. “I like the notion of introducing people to one book, while promoting the sales of another,” says the prolific and mega-selling author and coauthor of numerous thrillers. His Kindle download is the first book of Patterson’s Maximum Ride young adult series.