At the start of Ehrman's engaging fourth outing for barn manager Steve Cline (after 2005's Cold Burn
), Steve visits Louisville for the Kentucky Derby, courtesy of his newly found biological father, trainer Chris Kessler, who yearns to have his talented son work full-time. But Steve, who lives in Maryland, is considering getting a PI license and uses the time in Louisville to complete a class assignment: find out all you can about someone. He chooses as his research subject Nicole Austin, a Churchill Downs employee he met only once. When Nicole's corpse turns up, Steve quickly becomes the primary suspect. While working to clear his name, Steve is invited into the rarefied world of wealthy racehorse owners by Rudi Sturgill, a cheerful playboy who may be the killer. Though Ehrman has yet to master the tightly focused plotting of jockey-turned-author Dick Francis, equine-minded readers will enjoy his capable, savvy young protagonist and authentic depiction of the gritty world of horse racing. (Jan.)