About the book: year / Susie, Jack's sister, was sent a toy plane by her foreign uncle, and the Secret Seven in full force went to help her launch it. But, as luck would have it, the plane crashes in the garden of one of the houses. Jack was about to climb there, but the evil gardener drives him out. On the second attempt, the guys stumble upon a very strange circumstance - they haven’t lived in this house for a very long time, but in one of the rooms there is a gas fireplace lit…