This was a very thorough book on the historical background of Macbeth, the historical figure, not the Shakespeare character.
I got this on recommendation from a historian and I can see how this would be a great read for someone who has an interest in medieval Scotland.
For me, much of the detail was too complex. That is not a criticism of the book, but a reflection of my own knowledge and interest in this particular era in history.
However, the book did answer the questions I had about Macbeth's background, the differences between the play and historical facts, and the background to the issues of succession in this particular era.