Hi there

I am trying to find the name of a book I read over 10 years ago. It is possible that the book was written earlier back than that - maybe even in the 1970's.

I can only very vaguely remember the plot, but I know that the story was centered around a couple who on the surface seemed like they were husband and wife, but it turned out the wife used to be male and had had a sex change operation.

The Catholic Church was also involved in the story somehow.

The book also involved, I think, the custody of a child, or that the child was chosen to be the Pope or something along those lines.

I would be grateful if someone could please find the title of this book for me.

Thank you