Robin and Jenna are getting married. Robin is excited beyond words; Jenna is plagued by panic attacks and struggles to write her vows. But when they arrive at their secluded fairy-tale venue, sinister forces besiege them, threatening to tear them apart.
Three young programmers come across an abandoned technology meant to detect supernatural presence. They reverse engineer the tech and create an app for their phones which allows them to see ghosts, thus endangering their own lives.