Eleven-year-old Effie is excited to spend the holidays with her cousin Viscount George Baxter, in his very fancy home, Hartwell Hall. But when he mysteriously disappears, the family is left in a shambles. What could have possibly happened to the viscount?Effie thinks the new housekeeper may be involved. After all, George did suspect she might be a witch. But with no proof, and no clue as to where George has gone, Effie enlists the help of Ada and Nellie, two of the maids at Hartwell Hall, to help uncover the truth. But as they piece together the mystery, they soon discover secrets about the Baxter family that they never expected to find…