Really liked this movie besides the ending

Rating: 8/10 (6 May 2017)

Since they got rid of the B.B. boards I will write this out to the required number equivalent.
Heard good word of mouth about this movie but waited and just watched it last night. It is well done, produced, acted, and have no complaints on that. The suspense and that feeling I got from claustrophobia trying to get out of a place like the characters would be a nightmare.
The blind guy acted by someone I have never heard was amazing and I loved how it kept you guessing. To be stuck in a place like that when I kept thinking, how do you get out and the noise factor to a blind man was very original. He lost his daughter, it never says how he got his million or I don't get how they to the code to his safe which brings me to my point.
How in ending when they find the kidnapped "rich" girl as they never go to jail as he puts it, would the police not find her in the bondage gear she was in and that room and not put two to two together about the blind mans daughter. It is the only plot hole but it is the ending and it would of been much better in my opinion if he just died or was in a coma.
Anyway, enjoyed it but the ending just bugs me. Is it set up for a sequel I'm guessing with what it made domestically? It's also hard to see that actor who gets shot opening the door and not think of 13 reasons why and his role in it after 10 plus hours of viewing that well made series.