Introduction: the secret history of the Civil War in the north
"Secret secessionism in our midst": the failure of civilian investigations in the old northwest, 1861-62
Investigating desertion and disloyalty: Henry B. Carrington and the Knights of the Golden Circle in Indiana, 1862-63
"They are doing us an immense amount of good": the rise of army intelligence operations in the old northwest in 1863
An odious system of espionage: the intelligence network created by the Enrollment Act, 1863
Watching "Mr. Jones": army surveillance of Clement L. Vallandigham, the Ohio gubernatorial election of 1863, and plots to release Confederate POWs in the fall of 1863
"It is impossible to doubt this": army intelligence in the Northern Department in early 1864
"What I say about secret dangers is well considered and based on fact": how Rosecrans's detectives infiltrated the secret organizations in early 1864
"When government determines to act": how Carrington's detectives infiltrated the secret organizations in 1864
"I feel provoked beyond measure at the indifference of the president": convincing Lincoln of the danger of insurrection, summer 1864
A "narrow escape from a Civil War": the triumph of military intelligence in august 1864
"I make no assertions without proof": preserving the northwest in the fall of 1864
Postscript: the evidence of conspiracy.