Dorothy L. Sayers 
Gaudy Night [EPUB ebook] 

When the dons of Harriet Vane’s alma mater, the all-female Shrewsbury College, Oxford, invite her back to attend the annual Gaudy celebrations, the mood turns sour when someone begins a series of malicious acts. Who is responsible for the poison-pen messages, obscene graffiti, and wanton vandalism? Harriet asks her old friend Lord Peter Wimsey to investigate.