The first 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... Ten-year-old Tally is a servant girl at Mollett Manor. She sleeps in the scullery sink, and spends her days scrubbing, polishing and ironing (when she's not secretly reading books). Then Tally and her squirrel friend, Squill, find a secret library hidden under the manor - a magical library where the books come to life! When Mollett Manor is burgled, can Tally use the knowledge she finds in the books to catch the criminals? Can they even help her solve the mystery of her missing mother?

The second 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. So when Lady Mollett's new puppy, Widdles, is kidnapped, Tally and Squill head straight to the library. But will they be able to catch the dognapper or is it already too late?

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. So when ghostly noises start haunting the lady of the manor in the middle of the night, she's terrified and turns to Tally for help. But can the library help Tally catch something that no one can see?

The final book in The Trapdoor Mysteries, a series about Tally, a code-breaking, animal-loving girl and her best friend, a squirrel named Squill, who solve mysteries with the help of a secret library... Tally was once a servant girl at Mollett Manor - as well as the Secret Keeper of the magical library hidden underneath the manor's grounds. Along with Squill the squirrel, she used the enchanted books in the library to solve crimes. Then Tally finds out a secret about her past, her entire life changes. Suddenly she's travelling aboard a huge ship on her way to New York to try and find her mother. When valuable items go missing from passengers' cabins on the ship, everyone expects Tally to be able to catch the culprit. But will Tally be able to solve the mystery without the magic of the Secret Library?