The Life and Death of Anne Boleyn by Eric Ives is a fantastic read. It's one of the most in depth accounts of her life (seeing as so many other accounts tend to look at Anne as just one in the succession of Henry VIII's wives), and he poses very convincing arguments that paint Anne's execution as a result of political maneuvering and changing alliances beyond her control, rather than the far too simplistic reasoning that it was only because of her failure to produce an heir (or the even worse argument that it was because of her character). It also keeps a very balanced picture of the queen. When dealing with such a controversial figure as Anne, it's all too easy for authors to slip into the traps of either demonizing her or overly defending her. Ives strikes a neat balance between the two.