What was the terrible secret of Chateau Grammont, ancient French castle, hidden in the dense forest of the Marne valley?Its present owner, M. Fallieres, had purchased it, and with the expenditure of a huge sum had turned it into one of the show places of France; yet its thick stone walls and long corridors echoed at full moon with the heavy tread of ghostly footsteps and the mocking laughter of an unknown menace.No mirror could be kept in any chamber unbroken, and its servants could never be retained for more than a month. Two years of constant vigilance on the part of Fallieres and his young and lovely daughter, Yolande, had failed to disclose an inkling of the source of the nocturnal visits of "The Monster."The chance visit of Ralph Wallace, wealthy sportsman, to the chateau brought a terrified appeal for help from Yolande, and the rapid succession of terrible events that followed form the basis for Mr. Goodchild's new novel.Through the chateau's network of underground passages and into its towers the desperate battle against the unknown enemy is waged, with murder, unexpected revelations, and keen deduction racing the reader on to the climax which comes with the sharpness of the cracking of a whip.The Monster of Grammont was published in 1927.