In this Short Story Jam, your protagonist is going to do something morally reprehensible.
They do it because they believe they're going to get away with it, even though the penalty of truth is substantial.
You are going to test the premise that, "Honesty is always the best policy".
You might decide that the premise is true, or you may decide it's not.
Or, you may even contradict the premise by reframing it. For example, "Honesty only benefits those who gain nothing from hiding the truth."
Nevertheless, the outcome of the story must adhere to the story message: that there are times in which we're better off not knowing the truth.
What if you could tell any lie and get away with it?
Honesty is always the best policy
Sometimes, we're better off not knowing the truth, even if we want to