"Shut In" is a very mundane, predictable and derivative thriller, so the only noteworthy thing to wonder is why a classy and multi-talented actress like Naomi Watts agreed to star in it. She appeared in horror movies/thrillers before - like "The Ring" or the remake of "Funny Games" - but that was quite a long time ago. The times and the competition must be rough in Hollywood these days, I guess. Sure, "Shut In" remains a watchable and competently made little film, but it isn't the least bit memorable and you honestly have to be pretty naïve NOT to see the principal plot-twist coming. From quite early in the film already, in fact. Watts is a great actress, and if there still are a few atmospheric and intense moments to enjoy, it's undeniably thanks to her performance. She just deserves better than to depict a so-called "damsel-in-distress".