Finally, a proper book. Book 31 was Follow Me Down by Kio Stark. I'm lucky enough to know Kio a bit and I had to apologise to her that I only highlighted two words in the whole book. It was mostly because I was too gripped by actually reading the thing to worry about what I might keep on my kindle. It's a fantastic book.
On the other hand, the two words do, sort of, sum it up:
'Ghost mail"