Lissa, a twenty-year-old girl trapped in rural Pennsylvania, grapples with sex, drugs, love and loss. When a possible pregnancy forces her to take a hard look at her life, both her and the structure of the film mature, illuminating a brighter path ahead.

After her son Kevin commits a horrific act, troubled mother Eva reflects on her complicated relationship with her disturbed son as he grew from a toddler into a teenager.

The eponymous party is hosted by Queenie and Burrs, long-term lovers who are rapidly growing apart.