The Ninja Librarians: The Accidental Keyhand

Just a little story about your average sword-swinging, karate-chopping, crime-fighting ninja librarians
Dorrie Barnes had no idea an overdue library book would
change her life. When Dorrie and her brother Marcus
chase her pet mongoose into the janitor's closet of their
local library, they accidentally fall through a passage into
Petrarch's Library —the headquarters of a secret society
of ninja librarians who have an important mission: protect
those whose words have gotten them into trouble.
Anywhere in the world and at any time in history.

Dorrie would love nothing more than to join the society.
But when a traitor surfaces, she and her friends are the
prime suspects. Can they clear their names before the
only passage back to the twenty-first century closes
forever?