Tarzan of the Apes by Edgar Rice Burroughs

Racist early 20th century pulp. Interesting as a historical or cultural document.

Darkness at Noon by Arthur Koestler

The ideological debate is simpler than it looks because of how deftly Koestler handles the psychology.

HHhH by Laurent Binet

Binet believes he can produce a more honest book by repeatedly calling attention to the artifice of his project. This, along with its weird title, makes HHhH "post-modern." Remove that conceit, and you are left with a rolicking boys' adventure story.