For a three-act plot analysis, put on your screenwriter’s hat. Moviemakers know the formula well: at the end of Act One, the main character is drawn in completely to a conflict. During Act Two, she is farthest away from her goals. At the end of Act Three, the story is resolved.
Act I
Alex wages violent crimes in both the city and the countryside of a futuristic English state.
Act II
Alex is imprisoned for his crimes, and forced to undergo behavioral therapy to be "cured" of his evil tendencies once and for all.
Act III
After many complications, Alex finds himself interested in leading a peaceful and "normal" life, even after the capacity for evil has been restored in him.