Risk by Dick Francis

When he wakes in a pitch-black room with his hands bound, Roland Britten—accountant and champion steeplechase jockey—knows he’s entered a nightmare of someone else’s making. Wracking his brain to figure out who’s out to get him and why, he comes up empty, but somehow manages a death-defying escape. It isn’t long, though, before he’s recaptured. Now, with his life at stake, he must take every risk to outsmart his well-disguised enemy and save himself...