In this novel Buchan creates characters across a broad spectrum of Scottish social classes and backgrounds, and while no one except McCunn is presented in great depth, we are given sharp and revealing character sketches of other key characters. Heritage’s single handed defence of the actual tower and his attempt to free-climb away from the burning building show not only his actions but his reasons and thinking, why he is doing what he is doing. Wee Jaikie's inner life is only hinted at occasionally, but his dogged perseverance and resourcefulness come through at several moments when his interventions are important. In the final resolution of the story, a band of adventurers ranging from an injured laird and his faithful menservants to a group of semi-outcast street urchins from Glasgow have bonded and have combined to fight for a common purpose, out of belief in right and wrong, and allegiance to Scotland.