TV review: I watched The Staircase and changed my mind on his guilt about five times, and that was just in the first half-hour

Toni Collette’s Kathleen is funny and warm, thanks perhaps to the glass of wine that seems welded to her hand

The Staircase further explores the life of Michael Peterson, his sprawling North Carolina family, and the suspicious death of his wife, Kathleen Peterson. 

The Staircase (Sky Atlantic, Thursdays 9pm and NOW TV app) isn’t a whodunnit. It’s a did-he-do-it?

And, spoiler alert, we still don’t know what happened in this real-life case. Michael Peterson was convicted of his wife’s Kathleen bloody murder in 2003. The police reckoned he did it , while he insisted s he fell down the stairs.