If you don't understand something that doesn't need to mean it's bad. A lot of movie viewers these days enjoy shallow movies, where they don't need to use their brains. They want everything to be served, this movie doesn't work like that. In beginning, we see a cuckoo taking nest and Lorcan Finnegan wants to tell us something with this opening movie scene.
Gemma and Tom were brought to the new house by a creepy estate seller, later on, they get a child in a box where it says raise the child and be released. They don't know both the estate seller and child are some kind of creatures but not humans. These creatures, aliens keep humans trap in some kind of vivarium (closed area for keeping animals and plants for observation or research). Aliens are studying humans like lab rats and want to learn more about them so they can fit into the world unnoticed and slowly but surely take control of planet Earth. Gemma and Tom wasn't the only couple in the vivarium, we can see other families also there thanks to Gemma. Gemma was able to enter other dimensions and see other families there has the same struggle as they, but because aliens can manipulate time and dimensions she was ejected back to where she belonged. Also, Lorcan Finnegan reveals to us something important that I think a lot of viewers ignored. Food in a vivarium has no taste because the aliens don't know how real human food tastes like.
So let's back to the beginning with a nest and a cuckoo. The nest is a symbol for Planet Earth and the cuckoo is a symbol for an alien that is about to take the nest and we can't do anything about it.
They are here and they are observing us, it's only a matter of time when they gonna take full control of this nest aka Planet Earth.
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