Spoiler Then at least give us some token exposition to mention that the cameras are inconclusive here or they weren't working or the angle makes it look like she did it. It's just ridiculous. There are security cameras EVERYWHERE these days. I find it hard to believe the detectives didn't review every angle to make sure they had an open and shut case here. The film showed us the blade was nowhere in her hand when her sister died. Any lawyer would've asked for discovery or reviewal of the footage to create reasonable doubt. Her detective friend wouldn't have reviewed it? In the ending, Cecilia is at least smart enough to have Adrian look like the knife is in his hand before she cuts his throat IN HIS SECURITY CAMERA FRAMES. IMHO it's poor writing. They only think about the security cameras as a narrative device WHEN IT'S CONVENIENT.