The third book in The Trapdoor Mysteries, a series about Tally, a code-breaking, animal-loving servant girl and her best friend, a squirrel named Squill, who solve mysteries with the help of a secret library... Orphan Tally is the servant girl at Mollett Manor - and she's also the Secret Keeper of the magical library hidden beneath a trapdoor, underneath the manor's grounds. Along with Squill the squirrel, she uses the enchanted books to solve crimes...