Subject/Tag - Secret service

The Banner Weekly

Mortimor Monk, the Hunchback Millionaire; or, The Disguised Nobleman. A Tale of Sea and Land Fifty Years Ago
The Pointing Finger; or, The Outcast's Heritage. A Story of Secret Life and Secret Service in New York

Beadle's Half-Dime Library

746. Quiet Jack, the Secret Service Spy; or, Too Much for Red Leary. The Story of the City Park Tragedy
777. Dick Doom's Destiny; or, The River Blacklegs' Terror, A Romance of the Realities of the Secret Service
789. Sam Sheridan, the Secret Service Special; or, The Jamboree at Early Bird Bar
801. Kent Kirby, the High Kicker from Killbuck; or, The Roster of Rogue River Ranch. The Romance of a Range Mystery
802. Deadwood Dick, Jr.'s, Diamond Dick; or, The Cool Half-Dozen. The Romance of a Remarkable Raid
803. Dick Doom's Clean Sweep; or, Five Links in the Clue

Beadle's New York Dime Library

633. The Sea Spy; or, Mortimor Monk, the Hunchback Millionaire. A Tale of Sea and Land Fifty Years Ago
801. The Water Wolves' Detective; or, Trapping the Grave Ghouls. A Romance of the Pointing Finger

Nick Carter Weekly

379. The mystery of the Mikado, or, Nick Carter in Japan
380. An emperor at bay, or, Nick Carter defies the czar
381. The crime behind the throne, or, Nick Carter and the palace mystery
382. Holding up a nation, or, The little giant rules the world
383. Kidnapped in broad daylight, or, Nick Carter on his own trail

Tip Top Weekly

24. Frank Merriwell's Money; or, The Queen of the "Queer" Makers

The War Library, Pocket Edition

1. The War Detective; or, The Plotters at Washington. A Tale of Booth's Conspiracy

The War Library

66. The Army Detective; or, Following a War Mystery. A Story of Secret Service During the Rebellion
83. The War Detective; or, Secret Service in the Rebellion. A Story of Booth's Great Conspiracy
207. The Army Detective; or, Following a War Mystery. A Story of Secret Service During the Rebellion
232. The War Detective; or, Secret Service in the Rebellion. A Story of Booth's Great Conspiracy
344. The Army Detective; or, Following a War Mystery. A Story of Secret Service During the Rebellion
369. The War Detective; or, Secret Service in the Rebellion. A Story of Booth's Great Conspiracy