Curt Siodmak’s sci-fi classic Donovan’s Brain, first published in 1942, is a story of scientific experimentation gone terribly wrong: body dies, brain lives, scientist communicates with brain, brain takes control of scientist and makes him do horrible things. You already know this tale because it’s been recycled everywhere from Star Trek to The Man with Two Brains, but the German-born Siodmak’s first swipe at the theme is still tops. Highly recommended. The paperback version you see above appeared from Bantam in 1950 with uncredited, but very effective cover art.
Yes, sweetie, it’s bigger than yours. But I told you size doesn’t matter to me.