I got a question for you: Noughts & Crosses is a series by English author Malorie Blackman of young adult novels, including two novellas, set in a fictional dystopia. The series describes an alternative history of human evolution in which African people had gained a technological and organisational advantage over the European people, rather than the other way around, with Africans having made Europeans their slaves. The series takes place in an alternate 21st-century Britain.

Answer this question: where is the book noughts and crosses set?
Let's think first:
The important part for answering this question is: The series takes place in an alternate 21st-century Britain.
Therefore, the answer is in an alternate 21st - century Britain.