Good film but..... (major spoilers) don't open if you intend to watch it

I liked the film but the writer/director has 100% ripped off The Usual Suspects, and if Brain Singer ever watches this he will definitely sue.

I won't lie I saw the Brittany twist coming a mile away, but The Usual Suspects didn't come to mind until the last 20 minutes when I noticed all the similarities.

- Survivor telling their side of the story to the investigator
- Burn victim in the hospital who knows the baddies identity
- Killing off everybody who wronged you & putting the blame on someone else
- Investigator then figuring it out & running out of the building to find the baddie who has vanished
- Even the last line of narration said by the actress is similar to Kevin Spacey's

I am not a professional writer so please excuse any writing mistakes