STEVE INSKEEP, HOST:
People looking for holiday gift ideas have a resource - the NPR Book Concierge. It's a page with more than 400 book titles selected by NPR critics and staff. NPR Books editor Petra Mayer is here to explain how it works. Hey there, Petra.
PETRA MAYER, BYLINE: Hi, Steve.
INSKEEP: And let's first talk about what this is. This is not exactly one of those lists where the top books are listed one through 10 or whatever.