書中的Gertrude是一頭非常有主見的牛，有一天她飛到天上去，任憑Mrs. Rosemary想盡一切的法子，牠就是不肯下來！最後 Mrs. Rosemary會使出什麼殺手鑑讓Gertrude 乖乖的下來呢？相當有趣的故事。適合7歲以上兒童閱讀。
Johnson’s impressively polished first book tells a merry and mirthful story of a strong-willed cow with a singular ability. Despite the commands and cajoling of …. Miss Rosemary… this brazen bovine insists on flying through the air… After unsuccessful –though hilarious –attempts to apprehend the animal… Miss Rosemary devises a … scheme that rivals the gift of the Trojan horse for cunning.--- Starred review, Publishers Weekly.