When you’re not feeling well, which books do you turn to to make yourself feel better?

I asked this question on the Allusionist Facebook and Twitter, and hundreds of you responded, but a few answers came up again and again:
Terry Pratchett, Douglas Adams, JRR Tolkien.
Makes sense. Science fiction, fantasy: what’s more escapist?
Jane Austen. PG Wodehouse.
Also escapist, thanks to period setting - and, rich people problems not health problems.
Things you read when you were a child: Moomins, What Katy Did, Anne of Green Gables…
Taking you back to a time in your life that perhaps felt safer, or simpler...
...Harry Potter.
Boarding school shenanigans! Wizard problems not real life problems!
And, Agatha Christie.
Poison! Gunshots! Stabbing! Hang on, why would stories about murder make us feel better?

Well, they’re kind of supposed to make you feel better.