I'm currently reading "Les Sept Jours du Talion", "7 Days" in English, I think.
It's from French-Canadian author Patrick Sen?cal.
An horror-suspense story about a doctor who kidnaps his 5 year old daughter's murderer and rapist, locks him in a remote house and during 7 days, he tortures the captive, to make him feel what his daughter felt. A really, really excellent novel and you have to look beyond the torture. The book makes you think: "Is the doctor right? Would I do the same thing if my 5 year old daughter would be murdered and [censored]?"
The movie recently came out 2 weeks ago, can't wait to see it.