This one is a thriller dealing as it does with a serial killer who is a medical attendant in a hospital and who poisons patients during treatment. It is based on real events, there are no mysteries associated and the narrative is straightforward. The plot is therefore predictable and actually there is no suspense or surprise at any time. The movie apparently does full justice to the book titled " A true story of medicine, madness and murder". It is slow no doubt but director Tobias Lindholm must be credited for making it a dark, tense filled and sinister exercise which keeps the audience gripped. In this he is helped tremendously by talented actors Jessica Chastain and Eddie Redmayne who have given riveting performances which will surely fetch them awards. Eddie has nailed it as the vicious and brutal killer going about his task in a cold calculated manner. Jessica scores as the sick mother of two infant girls who has to cling on to her job in order to claim sickness insurance and continue working. In fact their acting is the highlight and mainstay of the movie. There are elements of realism throughout in the scenes at the hospital, of the deaths, and the following interrogations. Despite being slow I did not find the movie sagging or boring at any time because of the fine performances, a matching background score and catchy dialogue.

It always adds to the viewing experience when a movie is (accurately) based on disturbing real life events, and that's what makes this Netflix slow burner so much more compelling.

Of course it also helps when you get two Oscar winning heavyweights in Jessica Chastain and Eddie Redmayne as the two leads, and unsurprisningly, these two legit A-listers are absolutely brilliant in this one.

While the story largely focuses on the lives and relationship between two ICU nightshift nurses, what it's really about is the greed, self preservation and insanity of the money obsessed American healthcare system, where the mantra is very much "profit over life".

It's this underlying theme coupled with the fact that mass murderer nurse Charles Cullen (Redmayne) was responsible for up to 400 hospital murders (but charged with just 29) that keep you gripped and in a state of shocked disbelief as the film slowly progresses.

Eddie's portrayal of Cullen is aptly understated, creepy and foreboding while Chastain's Angel of mercy whistleblower is steely strong, compassionate and right on the money. A shout out as well to the rest of the small supporting cast who also do a stellar job.

Yes it's dark, dour and slow moving but the artistry and true life events on show here overrides all this - it's a must-see movie folks, because let's face it, this type of harsh reality relates to us all in one way or another.

If you are lucky to have a free, integrity based healthcare system count your blessings... you should after watching this! Heartfelt recommended viewing.

There's a new guy joined the team to ease the pain, help support emergencies, lessen the strain, a caring kind of type, helps you with your own health plight, doesn't seem like he'd do anything insane. But suspicions start to rise when someone dies, the authorities begin to cast curious eyes, as barriers are erected, more cadavers are connected, piece by piece, you recognise, what this implies.

It's a bit made for TV and nothing wholly original but the performances are fine and it may get you questioning how you perceive those you entrust your heart and soul to when you and/or your loved ones are at their most vulnerable.