Counterfeits and counterfeiting
Free to read here, from Project Gutenberg.
Troubled Waters
The secret of the old mill
The Mystery of the Iron Box
Counterfeit Money
Jack's Ward; Or, The Boy Guardian
Timothy Crump's Ward: A Story of American Life
The Universal Counterfeit and Altered Bank Note Detector, at Sight
Redlaw, the half-breed; or, The tangled trail. A tale of the settlements