The end does not make much sense anyway

Average thriller actually eerily exciting topic. Based on a true story. Remember however, that the end is fictitious. Because they can not really be that bad truth.
Spoiler!
Policewoman (Cusack's partner in the film) to have been the first woman to be the serial killer (the women he imprisons, call him "Daddy") was pregnant, to produce with their babies. He wants to be sure a father with many children as possible. You will probably always be mother. Or Daddy vaccinating her that this is the only meaning of life. Because she is infertile, kidnapped prostitute will now take their "mom job". Main thing somewhere come the babies and for prostitutes is not wanted usually long.
The police officer has himself transferred to Cusack's character, who wants to discover the cases of missing prostitutes. Allegedly, because she knew one of the missing women and has a personal interest in the cases. In reality, however, to cover up the horrific acts of Daddy and protect, if Cusack expose him as a serial killer sollte.Das everything one learns but only at the end.
In the showdown Cusack "Daddy" and is sending you kill shot from his partner that "Daddy" is still loyal. She takes with the past at the time in three incubators babies and want to start with them in a different city, a new life and finally his mother. As a viewer you will not know whether anyone noticed. The babies look about the same age and have different skin color and not look at otherwise similar (logically). In addition, of course, a father and to all documents, certificates missing somehow. This somehow makes everything not Sinn.Oder just only for a psychopath.
In the final scene we see how the policewoman on the AB of the daughter of the slain of their policemen (Cusack) speaks (who has been kidnapped by Daddy) and this notice that at the end of the message is heard a Babie. Then the movie ends.
As a viewer you so do not know how the whole case proceeds. If you find the police officer, one can detect her murder, one can reconstruct their own history? If the daughter might only guess that the babies are with her, but it can never prove?

The film leaves a way or a little perplexed.