The core of the plot is the romantic triangle formed by the protagonist, a conscripted soldier named Private Brigg, a worldly professional soldier named Sergeant Driscoll, and Phillipa Raskin, the daughter of the Regimental Sergeant Major. The location is a British army base in Singapore during the Malayan Emergency.

In Victorian England, a fortune now depends on which of two brothers outlives the other—or can be made to have seemed to do so.