According to English journalist Christopher Booker, there are only seven basic plots, but screenwriter Sylvester Stallone ("Rambo" and "Rocky") uses my favorite one (Overcoming the Monster). He gives us someone to root for and then puts that individual in jeopardy.
After establishing our hero's credibility as an undercover agent for an alphabet soup of agencies, this non-stop actioner gets started with a simple little case of grade-school bullying which results in a fist fight; the families quickly escalate the situation and from there on, the action rarely lets up.
This has a richly deserved R rating, so expect lots of profanity, broken bones and torture, many intervals of gunfire and drug use along with some highly satisfying blowie uppie stuff. However, I hope you noticed that I said in the first paragraph "Overcoming the Monster" so that means a happy ending! Whew...