My memory is that this is very much a standalone book, even though Inspector Grant is, obviously, a recurring character in a series of 6 books (of which this is #5). So I would say not to worry about it.
Full disclosure -- it's been YEARS since I read Daughter of Time. OTOH, the premise for this is completely different from other Inspector Grant books, given that it's not about a current, or even remotely current case, but about Richard III.
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