Here's an extract from a review of her book - from here:
But as is revealed in Jane Hawking's new tell-all, "Music to Move the Stars," their marriage was much more complicated than anybody knew.
Published in Britain by Macmillan, the 610-page tome of woe hits the shelves on Friday. In it, Jane Hawking chronicles the hardships of marriage to a famous genius with a famous degenerative disease. She is startlingly frank about her feelings, calling her ex-husband an "all-powerful emperor" and a "masterly puppeteer." She notes at one point, "It was becoming very difficult -- unnatural, even -- to feel desire for someone with the body of a Holocaust victim and the undeniable needs of an infant."
Desperate for emotional and physical fulfillment, she says, in 1985 she began an affair with a family friend, musician Jonathan Hellyer-Jones, whom she had met in 1977 after joining a local choir. Her husband gave tacit sanction to the relationship; the pair married in 1996.
As a stressed-out caregiver, Jane Hawking suffered huge bouts of depression. "A brittle, empty shell, alone and vulnerable, restrained only by the thought of my children from throwing myself into the river, drowning in a slough of despond, I prayed for help with the desperate insistency of a potential suicide," she writes. But she felt she had no option but to stick with the relationship. "I couldn't go off and leave Stephen. Coals of fire would have been heaped on my head if I had."