In the very first chapter of the Wax and Wayne series of Mistborn novels, Waxillium Ladrian, self-styled gentleman lawman of the Roughs, is hunting down Bloody Tan, a serial killer of some renown. Bloody Tan treats Wax's approach like a museum visitor, setting up a gallery of his kills, and for a finale work of art, takes Wax's wife Lessie hostage and pulls her into the path of Wax's bullet just as Wax tries to shoot him. Tan gets the second bullet, and Wax leaves the Roughs to escape Lessie's memory shortly after.
In later books we learn that this situation was manipulated by the god Harmony to get Wax to leave the Roughs.
Lessie was actually a kandra named Paalm, who had been assigned to watch over Wax by Harmony, and had fallen for him and was refusing to manipulate his life further. Harmony, at minimum, overrode Paalm by taking direct control of her and forcing the Tan scenario to end the way it did (bullets not being lethal to kandra).
The meat of the question is that if Harmony did this, how much of that entire setup was faked? Tan was the one that created his "perfect moment of art", was he also an agent of Harmony, or controlled? His dialogue certainly implies the latter, with his "something else moves us" comments. If it's the former that just raises more questions. There's no more information that I can find in the books though, and since most of Harmony's servants still hold by old oaths to not kill humans, my guesses as to what was real and what was setup feel pretty fuzzy.
So since the one agent we know of couldn't have done all of it, which parts were real, and which parts were controlled manipulation?