The Adventures of Heine

Collection of 18 short stories previously published in the Dundee, Scotland, newspaper Thomson's Weekly News and bundled as one volume the next year.
These tell the tale of a German spy living in England who goes by the name Heine. Ten of these contain action involving Major Hiram Haynes. They are:
The Affair of Mister Haynes
The Affair of the Allied Conference
The Murderers
The Grey Envelope
The Jermyn Credit Bank
The Passing of Heine
The World Dictator
The Syren
The Coming of the Bolsheviks
The Going of Heine