Good start, good tension but it meanders along with constant implausability. Some good acting and reasonable pace. Certainly better than The Happening as commented by other reviewers.

No reason for the events but it is a horror/thriller so I guess that's OK. It is definitely a step up from the average and there is not much of the standard ridiculous stupidity found in horror film victims but the blind action scenes are as implausible as Scent of a Women. (One of the more ridiculous movies ever made) Tense and watchable but average...