Snape smirked at her and produced the book from beside his chair, handing it to her. They worked together tirelessly for an hour or so until Hermione finally struck upon the spell Snape had been certain was contained within. It was all clear to her the moment she had begun reading the chapter in the journal. All she needed to do was gather all the data files for births, which could be easily accessed from any government-run organisation, and simply transfer that information to the map. Once she did that, the spell would automatically show the location of any person who had been registered in an official manner at birth.