I learned about the War of the Roses from "The Sunne in Splendour" by Sharon Kay Penman. It's an historical novel focusing on Richard III. It starts when Richard is 6 years old and his father, the Duke of York, is fighting for the throne, and ends when Richard is deposed by Henry VII who started the Tudor dynasty.
Available as an ebook in Kindle and Sony stores. (I didn't check B&N.)
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