Arthur Gask 
The Dark Mill Stream [EPUB ebook] 

A large sum of money was stolen from a London bank and hidden in an old mill in a lonely and unfrequented part of Essex. It is found by two men already deep in crime, and the dreadful murder of one of them follows.
Gilbert Larose, the one-time great international detective, when discovery seems well-nigh impossible, nevertheless, picks up the trail—almost from what he hears in the whisperings of the wind—and it leads him to an important country gentleman living in an historic mansion in Norfolk.
A story packed with thrills and surprises from cover to cover, featuring that most famous of all investigators Gilbert Larose at his brilliant best.