What is the theme of his latest novel?

The principal theme of the book is the American Revolution.

This theme should be treated in more detail.

The novel explores the themes of eroticism and desire.

A common theme underlies both perspectives.

The prolegomenon of the book provides an introduction to the main themes.

The proem of the book provides an introduction to the main themes.

The theme park was closed down last month.

We had a thrilling time at the theme park.

The prolegomena of the book provide an introduction to the main themes.