A. E. W. Mason 
The Courtship of Morrice Buckler [EPUB ebook] 

Doomed to hang from the gallows, Sir Julian Harnwood has only one hope of saving his life – Morrice Buckler, his best friend and devoted supporter. When Buckler heads out to Luckstein Castle in Austria to free the unfortunate Harnwood, great perils await him. And his opponent turns out to be none other than the beautiful but deadly Countess. Her viperous charms may prove too much for Buckler and a trap is set. Only one question remains: is the Countess or the heroic Buckler going to be caught?