The book began when he was sent to Madagascar by a magazine to find a rare type of lemur. He thought this would be quite interesting, but it turned into a complete revelation. His fascination with ecology led to an interest in evolution. “I’d been given a thread to pull, and following that lead began to open up issues to me that became the object of the greatest fascination.” A link at the bottom of his e-mails now directs people to the Dian Fossey Trust, which works to protect gorillas, and Save the Rhino. Adams was also a signatory to the Great Ape Project, which argued for a change of moral status for great apes, recognising their rights to “life, liberty, and freedom from torture.”

He was a founding member of the team that launched Comic Relief, but he has never been a hairshirt sort of activist. The parties he held at his Islington home would feature music by various legendary rock stars—Gary Brooker of Procol Harum once sang the whole of “A Whiter Shade of Pale,” including all the abandoned verses—and were peopled by media aristocracy and high-tech billionaires. Slightly less orthodoxly—for an enthusiastic, almost evangelical atheist—he would also host carol services every Christmas.

“As a child I was an active Christian. I used to love the school choir and remember the carol service as always such an emotional thing.” He adds Bach to the Beatles and the Pythons in his pantheon of influences, but how does this square with his passionate atheism? “Life is full of things that move or affect you in one way or another,” he explains. “The fact that I think Bach was mistaken doesn’t alter the fact that I think the B-minor Mass is one of the great pinnacles of human achievement. It still absolutely moves me to tears to hear it. I find the whole business of religion profoundly interesting. But it does mystify me that otherwise intelligent people take it seriously.”

This attachment to traditional structures, if not traditional beliefs, is carried over in the fact that his daughter, Polly, who was born in 1994, has four non-godparents. Mary Allen is one of them, and it was she who introduced Adams to his wife, the barrister Jane Belson. Allen says, “In the early eighties Douglas was going through some writing crisis and was ringing me every day. I eventually asked him whether he was lonely. It seemed that he was, so we decided he needed someone to share his huge flat. Jane moved in.” After several false starts, they married in 1991 and lived in Islington until last year, when the family moved to Santa Barbara.