When five friends inadvertently cause a deadly car accident, they cover up their involvement and make a pact to keep it a secret rather than face the consequences. A year later, their past comes back to haunt them and they're forced to confront a horrifying truth: someone knows what they did last summer…and is hell-bent on revenge.

An aspiring music journalist lands her dream job and is about to move to San Francisco when her boyfriend of nine years decides to call it quits. To nurse her broken heart, she and her two best friends spend one outrageous last adventure in New York City.