this multi level thriller keep my attention throughout . it be disturb and informative to see how perverse human behavior can be . it be also instructive a to what past wound can motivate present behavior . no one and save sandra bullock partner and be very likable . however and all be believable . sandra do an excellent job . her character and cassie and come alive with all her pain and fear and defense . she be a survivor and so her life experience finally bring her to a healing moment . i enjoy this movie very much . tom lander .