The novel revolves around two sociable junior officers of the British garrison then stationed in Quebec City, who enjoy a lively life of parties and pastimes. Lieutenant Alexander Macrorie, the narrator, rescues a mysterious young lady from the ice floes of the St. Lawrence River. When she disappears his search brings him surprising acquaintances and unexpected perils. His carefree sidekick, Jack Randolph, is trying to extricate himself from simultaneous engagements to three ladies.