IMO Episode 5 of The Undoing was:
Shark-jumpingly bad. The whole thing with Hugh Grant being responsible for his sister’s death, the call with his mom (by the way, “none of us is” and “none of us are” are both acceptable uses), the reveal that the kid saw his dad flirting at school (foreshadowing!), blah. Kidman being a therapist and the insight that might give her had apparently been given up on, thank God, then we have scene with Donald Sutherland “In your professional opinion, would killing his sister make him more or less empathetic…”. I posted the thing about them being horrible parents before the end of the episode because of them bringing him to court and abandoning him at the table at the restaurant (they would not have gone out to eat at a restaurant after court under any circumstances anyway). And she’s supposed to be this wise therapist!
So now I guess that Hugh Grant really did kill her, but the kid is somehow involved, which will prevent Kidman from revealing what she found.