The mystery is absorbing, but unfortunately, the big reveal is botched and a lot less dramatic than it should be. The film is based in part on the real-life case of Susan Smith, and the writing is quite good as it not only focuses on the crime drama aspect but also deals directly with the racial tension caused by these accusations. Price has written some fine films over the years, and I would include this among them despite the reservations I had with the film's final act.
Julianne Moore is at the center of the mystery, and her performance is the centerpiece of the film, at times heart-wrenching even when you know her motives cannot be trusted. It's a credit to the actor when you empathize with her character without really trusting her. Also good in a supporting performance is Edie Falco, head of a parent's group helping to locate Moore's missing boy. She is superb in the film's single best scene in which her conversation with Moore about her missing child subtly turns into a subversive attempt at getting a confession.
"Freedomland" is a smart film that falters in the third act. There are some stunning performances and a terrific script, but the resolution doesn't feel as satisfying as it should.
I know you're capable of choosing much better films to express your talent in than this. I can't imagine seeing another performance which restricts your abilities as an actress once again like this.