3. Young Sleuth on the Rail; or, Working Against the Train Robbers.
4. Young Sleuth and the Beautiful Actress; or, The Diamond Thieves of New York.
5. Young Sleuth’s Best Bargain; or, $20,000 for One Night’s Work.
6. Young Sleuth’s Night Trail; or, The Slums of New York.
7. Young Sleuth Behind the Scenes; or, The Keen Detective’s Great Theater Case.
8. Young Sleuth and the Widow in Black; or, Tracking a Child Stealer of New York.
9. Young Sleuth as a Hotel Detective; or, Solving the Terrible Mystery of Room 17.
10. Young Sleuth After Stolen Millions; or, The Keen Detective and the Safe Blowers.
11. Young Sleuth and the Dashing Girl Detective; or, Working with a Lady Agent of Scotland Yard.
12. Young Sleuth’s Ghost; or, The Keen Detective and the Confidence Queen.