Like "Pale Fire" or "House of Leaves", "S." Is a novel that requires more from its reader than simply reading cover to cover.

At the surface it is a novel called "The Ship of Theseus", about a man with amnesia, trying to solve the mystery of his own identity. In the margins, another story evolves as two readers pass the book back and forth, writing notes on the margins, becoming closer through their notes, while trying to solve the mystery of the identity of the author.

It is full of inserts, puzzles, and colour-coded text. Like other works of 'ergodic' fiction, it requires the reader to put a little more effort into the experience, flipping back and forth, reading parts again with new understanding.

I read the whole text of the novel first, then flipped through the whole book again four times reading inserts and the colour-coded notes. I feel like I only just scratched the surface.