Molly attends the wedding of her sister, but her husband can't come with, so she brings her son Tim. Tim's wife can't come either because she has to work. A twist of fate puts them in the same room at their hotel and an embarrassing tendency of Tim's makes for unexpected relations between mother and son.
The dark stone changes those that possess it. Just after his eighteenth birthday, Sam finds a strange rock half-buried near some old abandoned train tracks. They were a normal suburban family. When Sam brings the stone home with him, things slowly unravel. His mother finds herself in situations she never imagined. His sister tries to resist her new impulses. Even Sam's married neighbor falls under the stone's spell.
Hannah is showering when she sees her little brother spying on her. To punish him, she makes him spend the day naked while she taunts him with her gorgeous young body.
When Pamela suspects that her twins have been being intimate with each other she tries not to overreact. Mentally that is, physically her reaction is barely controlled and far from maternal