I liked this film, and I think other user comments are unduly harsh.
The script is more innovative than most crime thrillers. The script design -- of having interlocking baby monitors in next-door apartments -- and working that into the danger of the young children, is unique.
The acting is very good. True, the last five minutes are Hollywood Stale, and some of the things in the plot are unbelievable, but the film holds my interest.