Chronic overachiever Prudence Daniels is always quick to cast judgement on the residents of her coastal town. Her dreams of karmic justice are fulfilled when, after a night out with her friends, she wakes up with the sudden ability to cast instant karma on those around her.

Pru giddily makes use of the power, flexing it on everyone from public vandals to karaoke hecklers. But there is one person on whom her powers consistently backfire: Quint Erickson, her slacker of a lab partner and all-around mortal enemy.

Soon, Pru begins to uncover truths about Quint, her peers, and even herself. She discovers how thin the line is between virtue and vanity, generosity and greed . . . love and hate.