How to produce a book with everyone marked, related or not

[TomStrong]

I am doing a research project following the genealogy of the members of a church, many of whom are interrelated in various ways, but some are not. I would like to be able to include everyone that I have marked (or even better, everyone with a certain flag set, but I can work with marked) regardless of how or if they are related. A web project lets me do that, but can I do it as a book or report without scraping the web pages and trying to make a book that way?

[A Ginn]

The Who setting under Reports > Book lets you specify Marked people.

[A Ginn]

Note that the Who setting is only available with the Person Sheet format. The other book formats have the Prune option for filtering marked people, but I think those are less suited for reporting unrelated people.