At peace? Who but the insane would ever be at peace? What person who has enjoyed life could possibly think one is enough? Who could live even a day and not feel the sweet ache of regret?
The most difficult book I wrote was the fourth in a series of linked children's books. It was like pulling teeth because the publisher wanted exactly the same but completely different. I'd much rather just do something completely different even if there's a risk of it going wrong.