Anonymous
Post 08/19/2023 07:20     Subject: Can’t remember title, author (mystery-ish, palimpsest, London?)

It’s OP - I finally remembered it!
Ex-Libris by Ross King

The masquerade bit was from another / similar Ross King novel, Domino.

I have no idea why, but I woke up this morning thinking that the title of the book was Domino. Quick google search led me to the answer!
Anonymous
Post 06/30/2023 00:26     Subject: Can’t remember title, author (mystery-ish, palimpsest, London?)

Not sure about the palimpsest plot point, but I thought of The Weight of Ink, but not sure it's old enough
Anonymous
Post 06/29/2023 23:11     Subject: Can’t remember title, author (mystery-ish, palimpsest, London?)

Umberto Eco's "Name of the Rose"?