Buchan, John: The Power-House. V1. 5 Apr 2011
 

John Buchan, 1st Baron Tweedsmuir PC GCMG GCVO CH (26 August 1875 – 11 February 1940) was a Scottish novelist and Unionist politician who served as Governor General of Canada, the 15th since Canadian Confederation.

When his friend Charles Pitt-Heron vanishes mysteriously, Sir Edward Leithen is at first only mildly concerned. But a series of strange events that follow Pitt-Heron's disappearance convince Leithen that he is dealing with a sinister secret society. Their codename is 'The Power-House'. The authorities are unable to act without evidence. As he gets deeper involved with the underworld, Leithen finds himself facing the enemy alone and in terrible danger.