The Mystery of Landy Court — Fergus Hume

When Sir Piers Lametry is found murdered in the library of Landy Court, all the evidence points towards an opportunistic attempt to steal the family heirloom, the precious 'Sacred Ring.' But things are not so simple as they first appear. Burglar-turned-detective, Mr. Drage, soon discovers that every member of the household has something to hide -- and that his own dark past may be coming back to haunt him...