When a seemingly crazy man claims to be his wife’s rightful husband, a troubled counselor must must act like the seemingly crazy man if he’s to save his collapsing marriage.”

There’s a lot going here, so I think it might be best to clarify a few things.
First of all, who is the protagonist? The crazy man, the wife or the counsellor (who I’m assuming is the actual husband? That’s something else that needs to be made clear).
Secondly, what is the protagonist’s goal or aim? Whoever they are, what to do they want?
Thirdly, why is the counsellor’s marriage failing? Why does crazy man claim to be the husband, why must the counsellor act like him, and why does the wife belief this? If the story is a mystery, and these are questions that drive the plot, then considering asking explaining the situation that allow these things to happen?