At her best friend's urging, Erin, a single girl, attends her friend's Halloween party-hoping, as always, to find her perfect mate. But when she arrives, she discovers nearly everyone else there is part of a couple, OR she's already dated them. But the worst part? The host has invited her old boyfriend in hopes of reuniting them. As Erin spends the night avoiding her ex and the few other undesirable guys in attendance, she interacts with a colorful assortment of party goers - each with their own issues.