A quick search of the study reveals an atlas at a useful scale, and a few minutes perusal shows clearly the location of the Isla d'Azif, which is some ways off the Kingdom's southern coast.  Judging by the illustration, there's a castle there...and the tiny skull and crossed blades flag flying from the highest tower gives some idea of what the locals are probably like!<br/><br/>Although the letter does not indicate that the young gentleman in question is being held on the island, and there's many a league between here and the nearest port where a victim might be stashed, odds are that the castle will like as not prove to be a good place to focus your attentions in the long run.<br/><br/>There might be other resources available, but that's a question for the good M. Valliant.