Just consider the opening of the book:

"My name is Mary Katherine Blackwood. I am eighteen years old, and I live with my sister Constance. I have often thought that with any luck at all I could have been born a werewolf, because the two middle fingers on both my hands are the same length, but I have had to be content with what I had. I dislike washing myself, and dogs, and noise. I like my sister Constance, and Richard Plantagenet, and Amanita phalloides, the death-cup mushroom. Everyone else in my family is dead."

Tell me you didn't fall in love with Mary Katherine, even a little bit? Mary Katherine is one of the cutest and most charmingly eccentric protagonists I've ever met, and carries the short book splendidly.