In the 1950s, Laura and her seven-year-old son Cody drive to a remote home in California to flee from her abusive ex-husband. The family is threatened by the possibility of his return as well as the presence of a monster lurking in a nearby lake.They settle in, she sends her son to school, makes lunch for him and works at a company doing a typing job. Her son seems frightened because some entity from the nearby lake lurks around his room at night. But after a direct encounter with that monster he seems comfortable with it and calls it "pretty lady from the lake". But still he wants to go home, he always seems sad and depressed and argues with his mom to go back. But she always refuses. On his birthday she arranges a party and makes invitations for his classmates. But he says no one will come, even when she insists that he should at least give it a chance. Both of them decorate their house with balloons and Laura cooks delicious meals, but no one shows up.Laura gets drunk and quits her job. Then she goes to school to pick up her son but he is nowhere to be seen. She asks a policeman for help.At the police station, a lady asks Laura to recall the accident that happened to her son last year. Laura says that she was out for groceries, and her husband was looking after their son, but Cody fell into the pool. When she came back he was still there, so she jumped in the pool and tried to save him and paramedics arrived. She insists that they revived her son and he was alright, then asks for water and leaves the police station.When she gets home she finds Cody waiting for her there. He begs her to let him go as he should leave with the "pretty lady of the lake".In reality her son died in the accident, but she was unable to cope with the grief and became delusional. The year is actually 2022, the 1950's world was one created in her own mind. She relents and allows her dead son to go with the "pretty lady in the lake" and achieves a degree of peace at last. Laura then frees herself from her delusion and leaves her house in California to return to her home. (thanks to Wikipedia)