Bloodline Series Book 7, by Lynda Rees

Racehorse mogul, Levi Madison, and ad executive, Riley Powers, want to wed soon, but his sister, Corrie, and her bartender lover, Justin, were engaged first. Levi is preoccupied, prepping his hopeful for triple crown racing but misses his absent fiance. Riley’s home is invaded by a thug. Her neighbor is murdered. Her dad takes ill, and Riley witnesses Levi enjoying a tryst with a sweltering redhead. Odds are against them. Who will win the race–on track and to the altar?