I know the kind of world we live in, but I wonder if taking out an ad could work. I'm sure the police department would advise, probably not. Holly crap.
If the story played out that the title was forged and then sold the only one who has any chance of not being held accountable is the OP. From what I understand Courts won't get into a bunch of he said, she said stories about Titles and if proven there was forgery the OP would get his car back. It would then turn into a Civil matter between the step daughter and buyer which would could easily won but getting restitution is a whole different story.... Crappy story either way....