Roller
So. I've been awake for hours and I read loads of reviews.
Including one suggestion of a possible ending spoiler alert , 

which when I thought about it seemed a real possibility. Only because of something that HG said twice: on the patio when he held his hand over her mouth to stop her screaming. And secondly to his son, on the prison visit. Wanna hear it? 
I think it's totally ok to make suggestions/ending productions. On this tv series alone. Normally we don't do that on 'Telly addicts' - it's not the 'rules'.
But it's ok here? The reason for that is that literally none of us know how this is gonna end. The reason for that is that David E Kelley - who also did Big Little Lies with NK, has completely differed from the book.
The book is written from NK's pov and doesn't feature Husband HG at all. It's written as if she finds out her all these things about her husband : That he is not who she thought he was, that he is untrustworthy and has had an affair and thus her whole life is a lie. But it's also written from the premise that he is guilty of the murder. He admits this to her later in a letter.
There is no court case, because it's a given that he's guilty.
So this tv series is totally different. It's a who dunnit? Or rather did HE do it? Or her? Or her father? Or the lawyer friend etc?
None of us know how this tv series is gonna end.