Set at a dinner party, Coherence centres on couple Emily and Kevin and Kevin's ex-girlfriend Laurie, playing out a friendly meet up until the power goes out halfway through their evening. The party of eight is plunged into darkness, and all energy goes into attempting to regain electricity to carry on with their evening.
Upon wandering outside however, it's clear that no normal outage has hit their street - everything is shrouded in darkness apart from one other house. And strangely enough, that other house is an exact replica of the one they're already in.
With doppelgängers galore that can only be differentiated through different coloured glow sticks, the group soon realise there's more than one reality branching out around them, but what they can do to survive the strange ordeal, and why it's happening at all, are still a mystery.
Considering the film is populated by groups of people who are literally exactly the same, it's a pretty confusing watch; especially when they all become aware and start pretending to be members from different parallel dimensions. Whilst the details become irrelevant at the end, Coherence's dedication to a bizarre sci-fi plot twist is a great one, and will leave you guessing all the way up to its ambiguous ending.