R. Austin Freeman 
The Puzzle Lock [EPUB ebook] 

Richard Austin Freeman presents an ingenious case in this remarkable detective saga. When a store of priceless jewels vanishes without a trace, the brilliant Dr Thorndyke and his skilled associate Mr Polton are called in to chase a thief who leaves no trace. A mysterious stranger, incendiary bombs and intrigue weave a magnificently enjoyable trail through a great read.