Need some thriller book recommendations!

I have a train journey and need some thriller (or non thriller but good fiction novel) recommendations.
I've liked Agatha Christie's works and have read some of her famous and lesser known works.
Recently finished To Kill a Mockingbird for a change of pace and the Hidden Hindu trilogy (pretty good plot wise NGL, kept me on the edge)
Need some good underrated thrillers that'll keep me on turning pages.
I've liked The housemaid, Robert Langdon series for ref.
I do have Verity and Silent Patient with me but need something else as well, would be a combined 30 hours of journey so need some good recommendation!