Over lockdown we have become used to seeing films with very limited casts and set in isolate locations. They're usually possession-type plots, or ghosts, as these are easiest to create on a budget, and many simply have no followable plot and disappointing endings - if you can even get there. You can usually tell this sort of film by the Red Flag that the writer, director, producer is all the same person (and sometimes they also do the make-up, costumes and probably make the tea as well!)
The film then slowly escalates into a nightmare for Michael as he tries to track down the mysterious Prynne, with deaths and intrigue and a whole 'you cannot trust anyone' vibe. Very enjoyable indeed ... and the ending pays off what has come before.
My main concern with the film was why, if they had all the resources and money to pay Michael, terrorise his family, cause people to be killed, and to watch his every move, why didn't they know who this Phrynn was, what they were carrying, and do their dirty work themselves? It all seemed a little contrived to set all this up just, it seemed, to torment Michael.
However Neeson gives a powerful performance of a man on the brink, and the acting from all the supporting characters is great (including Shazad Latif who you might recognise as Clem Fandango from the series Toast).
Well worth 105 minutes of your time!