Death of Yesterday by M.C. Beaton

Art student Morag Merrilea reports that she believes that she was drugged and raped at a local pub.  Police officer Hamish Macbeth tells her that there's nothing he can do, since Morag won't go to the hospital to be checked out and she doesn't have any other details about the evening. She is also incredibly rude to Hamish. Later she disappears and is found dead in a bale of t-shirts. Hamish wonders if perhaps she had drawings in her sketchbook that someone didn't want anyone else to see. Soon, more deaths occur and Hamish finds himself in a familiar fix: trying to solve crimes while steering clear of his superiors' wrath--yet also still hoping for love.