Came across this in a novel, but (a) I’m looking for a factual answer, and (b) I’m interested in maybe changing up the details, to discuss what matters — and what should matter, which is why I’m erring on the side of figuring it’s GD territory (with the tl;dr in bold at the bottom).
That said, it’s a bit from a Nero Wolfe story:
Jarrell didn’t, as it were, say that; Jarrell said, to the private eye, that: “I’m making you a proposition. The day she’s out of here, with my son staying, you get ten thousand dollars in cash … The day a divorce settles it, with my son still staying, you get fifty thousand. You personally.”
So if he finds genuine evidence of an affair, and she gets kicked out of the house and divorced, paycheck ensues; but (depending on how you read “handmade”) he could arguably make a play for that paycheck by framing her with phony evidence, or by taking it upon himself to generate some genuine evidence by seducing her.
Later (since, again, this is a Nero Wolfe story), there’s a murder; and Jarrell makes clear that, hey, you’re a private eye who can investigate stuff; and if, say, evidence turns up that she’s guilty, and she gets sentenced to death — well, in that case, every penny I offered is still yours.
And, again, that’s true if the evidence is genuine, but it’s presumably true if he tries to frame her and gets away with it. (I figure there’s even an argument to be made that he could collect if he gets away with murdering her and, say, making it look like a suicide: so long as she’s not living there any more, and the son is, then — what did Jarrell agree to? What could Jarrell agree to?)
In other words: what happens if Guy A hires Guy B on terms that boil down to “I’ll pay you $60,000 if Event X happens”, and then:
1) Guy B legally works to make it happen?
2) Guy B illegally works to make it happen — which Guy A didn’t, in so many words, request; he just specified an outcome, without saying anything in the way of means-to-an-end, and maybe he’s not sure whether Guy B broke any laws?
3) It happens; but, as far as Guy A can tell, it had nothing to do with Guy B’s efforts; maybe Guy B put in a lot of work, but maybe he didn’t? Is that relevant?