Unlike some fantasy books, this had a clearly defined goal, and the characters made steady progress toward achieving it, which I really appreciated. While there are some descriptions of the different worlds through which Alice passes, they never drag down the plot. There is a lot of action and fighting, and Alice is triumphant most of the time, which is a nice change from forces of equal potency fighting all the time and ending in a draw!
Alice is a great character who does a good job of assessing her situation and using the forces around her to her own advantage. This series is a great one to give to readers who enjoyed Sanderson's Alcatraz versus the Evil Librarians, Yansky's Alfred Kropp, Funaro's Alistair Grim series, or Jink's How to Catch a Bogle series, although The Forbidden Library takes place a few years later, in 1932.