Since this is a horror novel, the price for Frankenstein's neglect has to be grave. So tons of people are killed and Frankenstein has to feel the losses one by one until he can no longer withstand the tremendous amount of grief and guilt sustained with each one. It's not so much diverting as it is really freaking sad.
"Thus not the tenderness of friendship, nor the beauty of earth, nor of heaven, could redeem my soul from woe; the very accents of love were ineffectual. I was encompassed by a cloud which no beneficial influence could penetrate. The wounded deer dragging its fainting limbs to some untrodden brake, there to gaze upon the arrow which had pierced it, and to die, was but a type of me." -Mary Shelley, Frankenstein |
That being said, it's a very well-written novel, and very well paced. And the lessons are laid out pretty clear for the reader: Curiosity killed the cat; be careful what you wish for; with great power comes great responsibility!
Next on the list: Prince and the Pauper by Mark Twain. I might at least get a laugh out of this one!