Unmasked by the Marquess

This is a looser interpretation of “eloping” than I'd like, but here we are - there is an elopement but it's not the MCs, so it does fit, at least. Anyway. I enjoyed this and I found the historical note at the end really interesting.

(2019 summer romance bingo: “eloping,” loosely but that's what I've got; would also fit “roadtrip,” possibly.)