The Rip-Off by Jim Thompson

Britton Rainstar never knew he could love a woman as deeply as he does Manuela Aloe and be so terrified of her at the same time. It's not just that he thinks she's out of his league. It's more that the longer he stays with her, the closer to death he seems to come. A vicious dog is somehow let loose in his hotel room. He's threatened at gunpoint by a man in a skeleton costume. And when he finally ends up in the hospital, someone pushes his wheelchair down the stairs.

Nothing anything like this has ever happened to Britt before--and while Manuela's never around when the so-called "accidents" happen, neither can Britt prove she's behind the many threats on his life. Is a rival for Manuela's affections trying to chase him away? Is there more to Manuela herself than meets the eye? Whatever it is, Britt better find out fast--before whoever's after him hits their mark, and the man who never thought he'd land the ultimate girl ends up paying the ultimate price.