David Cain breaks out of prison, just to send Cassandra a birthday present --- an old knife.
Meanwhile, a little girl has been kidnapped from her wealthy mother's house. Batman and Batgirl are on the case. Batgirl tracks down the kidnapper, and is shocked when the little girl refuses to be "rescued."
Batgirl realizes that the "kidnapper" is the little girl's father, at the same time she realizes something about her own paternal lineage.