Unputdownable Holiday books? Ones that live long in the memory?

As a preface, I love books like;

The Poet (Connelly)

Ready Player One (Clyne)

Sidney Sheldon in general.

Crichton

Da Vinci Code

My fav genre would have to be first contact sci fi, like the film contact. Nothing fantasy.

No love stories.

But my god, 2 or 3 books you've read on a holiday that you've never forgotten?

Thanks.