For Kicks by Dick Francis [Fiction, epub/mobi/pdf] {G4mbl3R}

Common sense said that the whole idea was crazy . . . but when offered huge sums of money to move to England and help the Earl of October uncover a suspected racehorse dope scandal, Danny Roke finds the proposal intriguing.

Swapping his job as proprietor of an Australian stud farm to work undercover as a stable hand in Yorkshire, Danny soon has his hands full. Whilst the Earl’s attractive daughters Patricia and Elinor draw his attention, he finds himself ever more deeply involved with the vicious swindlers he is out to entrap. And if neither the money nor the swindle will keep his mind on the job, maybe the death of the Earl’s original investigator, Tommy Stapleton, will . . .