If you like Black Mirror you'll probably like this film. It is about a small group of scientist who take a group of terminally ill people and give them a compound that causes them to die at the same time. When they do this they also manipulate time and space and capture what came to take these souls to the other side as they call it. What they end up with is not what they expected. The film presents ideas (a lot of them) and people make bad choices (much like every episode of Black Mirror) they all have had horrible things happen to them in the past which is why they all worked on this experiment.
The three scientist and the girl that appears are all very different people with different motivations making it hard to tell who if anyone is right in their actions. They each have a choice to make that will effect the out come of the experiment and the one scientist Louis is the most interesting character of the group as he constantly explains his thought on the universe, dark matter and death. The other two characters are conflicted due to personal loss.
There are some heady concepts in the film, if I can compare it to anything other than Black Mirror Shane Carruth's Primer would be the one film I would say is in the same vein. Over all a good entry into independent science fiction.
Review by jr-05172 from the Internet Movie Database.