Brooch with black opal

Agatha Vecher lives quietly, like a mouse, trying not to stick her head out of her burrow, working as a cleaner at night and reassuring herself that someday everything will get better… if only she stays alive. They have tried to kill Agatha more than once or twice. Who, why, and for what? It's unclear. There's no one to help her — she is all alone… Or is she? Maybe she actually has relatives and the reason lies in this?