Mystery writer Walter Mosley. He's written a new book in his series about gumshoe hero Easy Rawlins. It's called "Black Betty" (Norton). Betty's a shark of a woman who leaves dead men in her wake. Like the other books in the series, "Black Betty" has Easy in post-War, but pre-present South Central L.A.--this time the year is 1961. Mosley gained public attention when then-presidential candidate Bill Clinton said that Mosley was his favorite mystery writer.