One of the great moments in Margaret, Kenneth Lonergan’s long-awaited and under-publicized two-and-a-half-hour film, is when high school student and protagonist Lisa Cohen (Anna Paquin) approaches Mr. Aaron (Matt Damon), a well-meaning math teacher she had sex with, as he walks with a female colleague. Abruptly, Lisa tells the two teachers that she had an abortion. Mr. Aaron, who had given into young Lisa’s advances just a few weeks beforehand, tells her she should tell the father, whoever he is. Lisa says that it probably doesn’t matter, the guy is probably sorry. Mr. Aaron says that it doesn’t matter if he’s sorry, that doesn’t mean anything. The guy needs to own up to what he’s done.

The scene shows Lisa as a character in the mode of Hamlet. The story is about Lisa’s coming to terms with her sexuality and her thinking about culpability. Margaret has to make a big decision, and she goes about seeking the knowledge necessary to make this decision in a variety of ways. Approaching Mr. Aaron resembles Hamlet’s attempt to figure out if his stepfather is guilty of killing his father by staging a play and watching his reaction.

Margaret is the story of Upper West Side teenager Lisa Cohen who distracts MTA bus driver Gerry Marretti (Mark Ruffalo) by flirtatiously shouting to him about his cowboy hat as he drives a Manhattan bus. The driver runs a red light, accidentally killing Monica (Allison Janney), a middle-aged female pedestrian. Lisa lies to the police, covering up for the bus driver, and says that the light was green, when it was really red. As the film progresses, Lisa starts to think she made a mistake. She asks every person in her life who she respects whether or not she should go back to the police and tell them she lied. It is the best friend of the deceased—whose name Lisa got from making some phone calls—who eventually gets Lisa to revise her initial statement, saying it’s her responsibility to tell the truth.

Lisa does, and the film explores the question: Is it Lisa’s responsibility to tell the truth? Won’t she be hurting the bus driver, who has a family to raise and protect?

The film’s fidelity to exploring and ultimately answering these questions is one of its many strengths. It is a coming-of-age drama, but a sophisticated one. Writer/director Kenneth Lonergan seems genuinely concerned with tracking Lisa’s consciousness, watching her as she considers the situation and learns.  Nearly every scene involving Lisa shows her worldview coming up against someone else’s and Lonergan writes each scene with both knowledge of his characters and real verve. The film’s characters are all intelligent and idiosyncratic. We do see the characters’ foibles through what they say, but one never gets the feeling that Lonergan feels anything but compassion for them.

Lonergan’s subtlety and cleverness as a writer is exemplified in one scene between Lisa’s single mother Joan (J. Smith-Cameron) and her love interest, Ramon (Jean Reno). The two go to an opera, at Ramon’s behest, and the show ends with tuxedoed audience members shouting “Bravi!” “Bravi!” On their walk out, Joan comments on how pretentious the Americans are who shout “Bravii!” Ramon explains that it is customary in Italy to shout “Bravi” because it is the plural of ‘bravo.’

JOAN:  It’s just so pretentious. “Bravi!” “Bravi!” Why can’t they just say bravo?

RAMON:  Well it’s the plural.

JOAN:  I know—

RAMON:  It’s the plural of “Bravo.” It’s what they say to acknowledge the ensemble.

JOAN:  No, I know it’s correct, it just—don’t you think there was something a little pretentious about those people?

RAMON:  Pretentious?

Here, Lonergan subtly dramatizes the new couple’s inability to connect. As one watches the film, it becomes more and more clear that, in addition to the expansion of Lisa’s consciousness, it’s the development of relationships that is driving the movie forward.

Lonergan imbues each of his characters with sparkling intelligence, particularly Lisa, and this makes for exciting and often combative interactions. So often in the film, we don’t know who to root for. When Lisa argues with her mother, Joan, or the deceased’s best friend, Emily (Jeannie Berlin), with whom Lisa eventually partners to bring a lawsuit against the city, it’s difficult to say which of them is acting irrationally. Lonergan isn’t pursuing a simplistic idea of youth being wiser than adults, but he does show the messiness of relationships and the fallibility of people in general, no matter how intelligent they are.  Most effectively, he dramatizes how difficult it is for a child to sort through the varying worldviews held by the adults by whom she is surrounded.

Consider this interaction between Lisa and Emily, the executive of the deceased’s estate. Here, Lisa explains that when she held the dying Monica in her arms, the woman mistook her for her deceased daughter (coincidentally, also named Lisa).

LISA: But then when I found out her daughter was dead, ever since then I keep having this really strong feeling that some way, for those last five minutes I kind of was her daughter. You know? Like maybe that’s the reason I was there: Like in some weird way, this obviously amazing woman got to see her daughter again for a few minutes, right before she died.

EMILY (very dry): I see.  And is she still inhabiting your body? Or did she go right back to the spirit world after it was over?

LISA:  I didn’t mean she was literally inhabiting my body. I don’t believe in all that stuff at all.

EMILY: I don’t give a fuck what you believe in.

LISA:  Oh my god!  Why are you so mad at me!?

EMILY:  Because this is not an opera!

LISA (flushing): What? You think I think this is an opera?

EMILY:  Yes!

LISA:  You think I’m making this into a dramatic situation because I think it’s dramatic?!?

EMILY: I think you’re very young.

LISA:  What does that have to do with anything? If anything I think it means I care more than someone who’s older! Because this kind of thing has never happened to me before!

EMILY:  No, it means you care more easily! There’s a big difference! Except that it’s not you who it’s happening to!

LISA: Yes it is!  I know I’m not the one who was run over—

EMILY: That’s right, you weren’t. And you’re not the one who died of leukemia, and you’re not the one who just died in an earthquake in—Algeria!  But you will be. Do you understand me? You will be. And it’s not an opera and it’s not dramatic.

LISA:  I’m well aware of that!

EMILY:  And this first-blush phony deepness of yours is worth nothing.

The scene starts to wind down when Lisa tells Emily she’s being ‘strident.’ Lisa isn’t sure about her usage of the word—she claims that she didn’t know exactly what it meant, and that she must have misused it.  But Emily is being strident. She also has a point—Lisa does need to be aware that this situation is affecting others more than her, that she is not the center of the universe. But Emily could stand to work on her delivery. Lisa is forced to learn two things here: one of them is about herself, and the other is about Emily.

The brilliance of this film lies in that we sort through the moral dilemma with Lisa; we grow and learn with her.

It is a grueling, glorious and enlightening experience and, for my money, the best one offered in the cinema today.

Eric Rosenblum is the founder, editor and host of www.theartsinnyc.com.  Eric teaches writing and English at Pratt Institute. His writing has appeared in Guernica Magazine, the Chicago Tribune, the Chicago Reader and Playboy.com.