This is one of those fantasy novels in which mathematics and magic are intertwined. As usual, it is nice to see mathematics portrayed as being simultaneously powerful and beautiful...but there isn't much more to the role of mathematics than that.
The plot follows Alivet Dee, inhabitant of a planet where humans are controlled by a demonlike enemy. The plans of her distant ancestor, the famous mathematician and alchemist John Dee, eventually join up with her own plans to free her sister from slavery.
