"dateline." a social worker made one of her toughest cases deeply personal when she decided to adopt annie. over the years annie thrived, but it turned out she was keeping a secret that was only discovered after her disappearance. could a fake pregnancy really have been the motive for an a all-too-real murder or had annie run into a wrong crowd. here's dennis murphy in "the girl with the red shoes." >> reporter: veronica kasprzak bratcher is a determined woman. did someone ever say, you can't save them all, to you? >> my mother is probably the one that would say and still says that. but yeah, i heard that a lot.mo >> reporter: she rarely listened though. the desire to do good, to save a child was too strong. though sometimes, in the quiet hours, she wonders if she did the right thing. >> if i wouldn't have picked that house.wo if i would have not taken a shower. if i would have done something