Thanks to Cinema Retro for the link:
Cinema Retro: The original 1818 edition of the novel Frankenstein was published anonymously. Five years later, its author - Mary Shelley- decided to put her name on all future editions of the work, capitalizing on the sensation it caused in the literary world. From the start, however, there were skeptics who doubted that an 18 year-old woman could have conceived such sinister goings-on. Shelley tinkered with future printings of the novel and never hid the fact that her husband Percy gave her advice and editorial assistance. The extent of his participation has long been debated among scholars. A new edition of the book from Random House will list Percy as a contributing writer, albeit in parentheses next to his wife's name. For the full, fascinating story click here
Ed here: I remember when certain academics insisted that Zelda Fitzgerald had helped to write some of husband Scott's work. Anybody who'd read Zelda's work--she was an accomplished writer--knew that any such collaboration was unlikely but the theory was pushed forth with great defiance until, I believe, it crashed back to earth. The Frankenstein case seems more logical but we'll see. Victoria Rosner's column makes its case perfectly.