The Bookwoman's Last Fling — John Dunning

When wealthy horse trainer H. R. Geiger dies, Denver bookman Cliff Janeway encounters the legacy of the man's wife, Candice, a true bookwoman who left behind an assortment of rare first-edition children's books. Sent to assess the collection, Janeway soon finds that several titles are missing, replaced by cheap reprints -- while other hugely expensive pieces remain. Why would a thief take one priceless book and leave an equally valuable volume on the shelf? Suspecting foul play, Janeway follows the trail of Candice's shadowy past to California's Golden Gate and Santa Anita racetracks, where he signs on as a racehorse hot walker. Eavesdropping on the chatter among the hands, he doesn't like what he hears. And when he goes to the house where Candice died to look for answers, Janeway finds much more than he bargained for.