In McEvoy's fine fourth horse racing mystery (after 2008's Close Call
), FBI agents persuade reluctant sleuth Jack Doyle to work undercover for a Chicago trainer to discover the culprits fixing races by “sponging” the favorite, an ugly practice that deprives the horse of enough oxygen to race effectively. Interwoven is the feel-good story of the Significant Seven—seven middle-aged friends who parlayed a huge pari-mutuel win into a small but successful racing syndicate thanks to the racing and stud career of a horse named the Badger Express. Seven years after their initial win, a pair of trained killers, both ex-navy SEALs, begin systematically eliminating the syndicate members. When Jack becomes suspicious about their deaths, he also becomes a target. McEvoy is a racing expert whose knowledge permeates the pages, and, like any good tout, he's full of amusing stories about horses, bettors, and trackmen. (Apr.)