Sapphique (/sæˈfiːk/ saf-EEK[1]) is a young-adult fantasy and science fiction novel written by Catherine Fisher, first published in 2008 in the UK.

She originally became his assistant in order to acquire his glove, having previously belonged to Sapphique, the legendary Sapient who escaped from Incarceron.

In The Realm, Finn is told by Claudia that he was originally Giles, a prince thought dead.

Jared, Claudia's mentor, meets the two in the wardenry, having nearly been killed by an assassination plot.

As I neared the end of Incarceron I realised there would be a sequel, but I didn’t think it would make a trilogy.

Sapphique picks up a few months after the earlier book ends, and I can’t say too much about the plot without giving things away.

Its futuristic technology oversees all the inmates inside through glowing, red eyes, and tortures them with the hope of escape, an unattainable goal only a legendary figure has attained.

Initially, the intent of Incarceron's creators, the Sapienti, was to incarcerate all the criminals in the world and repair their morals to form a perfect society, controlled with the help of the Prison entity 'Incarceron'.

However, after years of isolation and the failure of the perfect society, those inside have no way to seek help or escape when the Warden abandons the experiment's aims.

However, since then, King Endor released a royal decree that Time would be "stopped" in order for humanity to survive, and now the Realm is trapped in the 17th century.

The Protocol prevents the development of science and evolution, and has since hindered Sapienti, and provided problems against freeing those in Incarceron.

Several of the creators entered Incarceron with the intent of passing knowledge to the inhabitants and ensuring the success of the experiment.

Outside of Incarceron, the Sapienti are greatly respected for their knowledge and often are allowed to breach protocol.

The paperback shows two golden swans attached by chains around their necks and decorated with diamonds.

She further explores themes of reality, illusion, and freedom without losing her intensely original world-building and authentic characters.