March, 1875. Although he has never had much time for George Custer, hero of the American Civil War and Commander of the 7th Cavalry, Matthew Grand feels duty bound to respond to a call for help from his West Point contemporary. Arriving at Fort Abraham Lincoln, deep in Dakota territory, private enquiry agents Grand and Batchelor discover the fort to be a powder keg of rumour and suspicion, petty rivalries, resentments - and closely-guarded secrets.

When a body is discovered during a routine scouting patrol, some of those secrets rise uncomfortably close to the surface. Are the Lakota Sioux responsible? Or does the killer lie closer to home? Could it have been a case of mistaken identity - and was Custer himself the real target? The General has made many enemies - but does someone have a good enough reason to kill him?