Emily Vole makes headline news in the first weeks of her life when she is found in an abandoned hatbox in Stansted Airport. Then only a few years later her neighbour Mrs String dies leaving Emily a mysterious inheritance: an old shop a small bunch of golden keys & a cat called Fidget. It's the beginning of an adventure of a lifetime as the old Fairy Detective Agency comes back to life. It is up to Emily to reopen the shop & recall the fairies to duty. Together they must embark on their first mystery & do battle with their great fairy-snatching enemy Harpella.