In a suburb populated by wealthy and liberal parents who want a bucolic life for themselves and their children, Wendy, Billie and Ann are seniors at the alternative private school; they spend all their time with fellow students Jonah, Price and Robert. The six have been friends since elementary school and their friendship has become a six-person monogamous relationship. They swap sex partners each week; their loyalty is to the group, not to one person. The six friends don't want to survive high school - they want to transcend its pettiness. Their friendships are intense, especially between Billie and Wendy. After orientation, Wendy meets Sean, a new senior who moved from Chicago; he finds out about her "inner geek" and she quickly recognizes a kindred spirit. Soon their friendship becomes romantic and Wendy is torn between her genuine affection and desire for Sean, and her commitment and belief in the group. Wendy starts to test the boundaries of her vow to her friends, and Billie ...