Sword in the Stacks (The Ninja Librarians #2)

Now official apprentices of the Lybrariad, Dorris and Marcus have joined Ebba in the immense time-folding labyrinth known as Petrarch's Library for the Summer Quarter.

Dorrie is eager to do well at her practicums, and prove her worth as an apprentice, but before she can choose between "Spears, Axes, and Cats: Throwing Objects with Precision and Flair” and "First and Last Aid: When No One Else Is Coming", mistakes made by Dorrie in the past cause trouble for the lybrarians.

The Foundation, once nearly destroyed by the Lybrariad, now has the means to rise from its ashes, and disappear reading and writing from the world. To make sure it succeeds, the Foundation sets in motion a dark plan to increase the power of a cruel figure from the fifteenth century.

To stop the Foundation, Dorrie, Marcus and Ebba will have to burglarize Aristotle, gather information among the suffragists and anti-suffragists of 1912 London, and risk their lives to wrest a powerful weapon out of the Foundation's hands - all while upholding the Lybrariad's first principle of protecting all writing, appreciated or despised. If they fail, reading and writing will only be the first things to disappear.