Is Olan's sister a vampire too? If not the person could be threatening to report to whatever authority that she is in order to get revenge for some wrong the person feels the sister had done to them or as a ploy to draw Olan out.
I too just noticed this section. My past work has been primarily paranormal mystery but I recently started my first fantasy book and thought this might be a good place to get some guidance. I have always loved reading fantasy and I'm excited because in fantasy literally anything is possible...