Rubbish! Let's put the horrible storyline aside. AUTHENTICITY, ZERO!
This is a woman who's gone through Cancer and fortunately survived with so much support from her husband.
How does she change overnight and decided he's a villain after he kills some intruders who are STRANGERS to her?
From there on, she suspects him all through, all through! Even the way he chews becomes suspicious to her. There's no suspicious history or suspicious behavior from him that warrants all the doubt from his wife. She just went to sleep and woke up a detective.
A man she's been with for over 12 yrs turns into a villain overnight? She even ends up killing him after things go south overnight! Like, one minute they are so in love and throw a housewarming party, the next, she sees something in the NEWS and switches back to being suspicious. From there, the film is rushed for reasons we are yet to understand.
In a blink of an eye, Henry is dead. We are not even made to understand what he was doing with the girl in the basement and if he'd ever done it before.
Then the acting....wueeh! Let me just sleep.