Three to One Odds by D. M. O'Byrne

With their winnings from the local racetrack last season, jockey Tonya Callahan; her trainer father, Royce; and his new bride, Lexi, buy a farm where they plan to breed racehorses. But their peaceful life is shattered when a strange man shows up at their home, claiming to be Lexi’s husband. When the man is murdered, all the evidence points to Royce, and newly promoted police lieutenant, Adam Abarca, hauls him off to jail, leaving Tonya no choice but to conduct her own investigation. Again. As she follows a trail of betrayal, cruelty, and deceit in her quest for the truth, she discovers that someone who has committed murder once won’t hesitate to kill again, and her odds of surviving this new investigation are slim to none.