I wouldn’t dare reveal where The Forgotten goes, but suffice it to say the movie ends up in a place that is very, very far from where it starts. That’s too bad, for the first third of this increasingly erratic thriller works as a moody meditation on the nature of grief. Julianne Moore stars as a book editor whose memory begins to play tricks on her as she mourns the death of her 9-year-old son. The Forgotten leapfrogs from this intriguing premise to ludicrous levels.