The Feel of Her

Carl works at an old library in a small town. The library is filled with old books and outdated equipment, but it is something he likes to do on his weekends. Mainly because she comes in every Saturday, a mystery woman who has caught his attention. She strolls in and catches his eye. She is intelligent, sophisticated, and alluring. But who is she? Carl hasn't got her name, and no one in this small town has seen her or knows anything about her.
Except for the fact that every Saturday she  comes  to get a few books from the library. Carl has to solve this mystery and find out who she is. Where does she come from? What's her name? Why does she come to this library?