My father and I just finished The Treehouse Library, Book Five of Anna James' Pages & Co. series.
It is Milo and Alessia's story now, and when botany and bookwandering blend in a hunt for the cure to an evil supergenius' imagination-based alchemical poison you sure go to some interesting and odd places, both on and off-board the Sesquipedalian (and that has got to be one the strangest sentences I have ever written). From Rosa the Botanist's Treehouse Library which also houses a rather amoral grandmother, tis off to sort of rob Robin Hood, seek in the Secret Garden, pluck a strange spoon off a swooning owl and cat, and jab the Jabberwock by the Tumtum tree. "'And hast thou slain the Jabberwock? Come to my arms, my beamish boy! O frabjous day! Callooh! Callay!' He chortled in his joy." Only the joy did not last as now all of bookwandering, imagination itself, and their families lives is at stake – for nothing and no one is safe against the Alchemist's ambition. Which means tis time for Tilly, Oskar, Alessia, Milo, and Rosa to find the Book that holds the key and the myth-made man, man-made myth, who guards it in a place that feels very, very fitting.