Overview
Coherence is a 2013 American surreal science fiction psychological thriller film directed by James Ward Byrkit in his directorial debut. The film had its world debut on September 19, 2013, at Fantastic Fest and stars Emily Foxler as a woman who must deal with strange occurrences following the close passing of a comet.
Plot
On the night of Miller's Comet's passing, eight friends gather for a dinner party at the home of couple Mike and Lee. Emily is hesitant to accompany her boyfriend Kevin on an extended business trip abroad. Amir has brought Kevin's ex-girlfriend Laurie, who flirts inappropriately with Kevin.
A power outage occurs. Mike and Lee bring candles and different colored glow sticks. The friends each take a blue glow stick and venture outside where the neighborhood is dark but for one house that has lights. Back inside, they notice a broken glass no-one remembers damaging. Amir and Hugh decide to ask to use the phone at the lit-up house, as Hugh's physicist brother insisted Hugh call him if "anything strange" were to happen during the comet's passing, and no one's mobile phone has signal.
From Wikipedia (CC BY-SA 4.0).