In the centre of the freezing Lake Beluarum stands an inescapable asylum, enclosed by the sheer cliffs of Drop Rock island. When Ambrose Grammaticus, famous inventor and master engineer, viciously attacks his own son, Rex, he is hauled to the island and imprisoned. Rex knows his evil stepmother, Acantha, is behind his father's 'madness', but how can he prove it? Only the asylum holds the answers...