Singular "dice" is common in UK English. This article discusses it, and refers to a 2006 article, coincidentally about this book, also in The Guardian:

https://separatedbyacommonlanguage.blogspot.com/2006/09/die-...

It’s a dice, and data is singular, language evolves, it’s not so important, artists can use it how they see fit.

To be fair, the title of the novel in question gets it wrong as well.