I recently read Charles and Emma, The Darwins' Leap of Faith, by Deborah Heiligman (Henry Holt 2009). This is a delightful and surprising love story about Emma Wedgewood and her cousin Charles Darwin. They fell in love and married at age thirty. Emma was very much like Jane Austin's Emma in Persuasion. She had beauty, family wealth, a grand home, and made a perfect match in marriage. Their differences, her devout Christian beliefs, and his agnosticism, did not diminish their love for one another.
Together they had ten children, and their large, comfortable home in Kent rang with the shrieks and shouts of vivacious and uninhibited children. Charles suffered with bouts of sickness most of his life, and at one point, when he thought he might not live to see his research published, he left written instructions that Emma should edit, and then publish his manuscript The Origins of the Species. His trust in her, and her love for him was complete and absolute.