SanEat A film with more than the usual spoiler issues. Talking about it in any detail feels akin to handing you a gift-wrapped present and saying, "I hope you like it -- It's a thriller about a diabolical secret experiment."

Bluebell Alcock Ok... Let's be honest. It cannot be the best movie but is quite enjoyable. The movie has the potential to develop a great plot for future movies

Tyreece Hulme One of the best movies of the year! Incredible from the beginning to the end.

Sabah Hensley This is a dark and sometimes deeply uncomfortable drama

motman-42914 Started with the promise of plenty of suspense in the first two episodes.However the climax was totally unbelievable and lacked any logic. Also I think it could have been filmed in just two episodes and not as three. I now regret having wasting my time watching this series. A disappointment as it started so well.

guylyons This production could have been a ten. A complex tale about a replacement professional being hired to cover, for a senior Architect, in a small practice.As the story progresses, you become hooked, and are left guessing about every major character. There is quality tension, in more than a few scenes, and unlike some dramas a more restrained type of shock hits you, which is far more effective. Vicky McClure is simply superb, and i could watch her all day, as my wife equally agreed. Unfortunately Morven Christie, and Richard Rankin, were not as eye catching. One can find faults in the story line, but it entertained us both, and was enjoyable viewing. I bet Hitchcock would loved to direct this tale. The ending could have been so much better, and in dramas like this, having rather different or even sinister closure, would make it far more memorable. I also think there is plenty of room for this type of work, and even wonder if writers consult with genuine drama lovers, as to how to get the best out such stories. Reading complete reviews of this is risky, simply do what we did, and enjoy it.

davidpodmore My main problem with this is the main character. Totally unlikeable, you don't really care about her and her problems and you don't feel good for her when things work out OK. That is quite important in a show like this, although yes they obviously wanted the viewers to question her and not be quite sure about her personality and motives but you end up not routing for her at all. It's almost a really bad message because it all works out for the woman and she is a complete nightmare, just less of a nightmare than the other. The show was OK but if you don't like or care about the main characters it is tough and the likable characters (the men) were secondary in the story and both lose out. Not bad but seemed rushed at the end too with a very dodgy finish.

jc-osms This excellent, suspenseful three part thriller was all the better for featuring identifiable locations in my ain hometown. The tension was skilfully ratcheted up episode by episode as a routine maternity-cover employee arrives at a successful Glasgow city centre architect firm, where young up-and-coming architect Ellen has just secured a major contract to design a contemporary library, but who gradually suspects her all-too-perfect stand-in Paula of taking over every aspect of her life. But is she herself just being paranoid? Married to a psychiatrist (and whose mother was also a shrink), with whom she's just had their first child, we learn that they first met when she was his patient. Not until the conclusive final episode does it become abundantly clear just who the psychologically disturbed party really is, indeed there was actually a point where it seemed as if evil was going to win out but a miraculous near-death recovery precipitates an ending where just desserts are served all round, including to her less than staunch husband and loose ends are tied up.The title of the piece might seem unimaginative but in fact once the evil-doer's intentions become clear, it's obvious that it's not only her rival's job as lead architect that she's attempting to replace.The idea of the deranged home-wrecking female of course has been around for years but I liked the twist here of the real motivation for the perpetrator's deranged actions which again aren't revealed until the end and turned out to centre on child-loss bereavement. Actually, whilst saying that, I was probably a little disappointed when a murder occurs out of nowhere in the form of the suspicious death of the wife of the husband and wife business owners, as I thought at that stage the drama didn't need any further heightening but thankfully it didn't trigger a spree of killings which narrative restraint I must admit I appreciated.The acting by the principals was very good throughout, Morven Davies as the triumphant young career-mother who can't quite believe what is happening to her, Dougray Scott as her conflicted but admiring boss and especially Vicky McClure, last seen on the right side of the law in "Line Of Duty", now excelling as the unhinged Paula, portrayed almost as a Mary Poppins' evil doppelgänger.Sure there were some holes in the plot and some of the characters' actions and motivations didn't always add up, but in the end it played out very well in a clear, bright production (it's shot almost entirely in daylight, office hours with no clichéd danger-at-midnight darkness scenes) that was well-filled, well-paced, well acted and well executed.