In book one, we meet a caravan of merchants for the first time, when Symin comes to their aide. These caravans travel the length of Cinder, from Leusbay in the north to Horde in the south.
With the rangers becoming a more active and visible force in the nation, they now journey with these caravans along with other travellers. As is the way of such things, some of these merchants wish to break through the boundaries that have isolated Cinder for centuries to ply their trade to the world, and bring back whatever marvels they discover. That is, if they live to see their beloved homeland again.
There is not yet any estimated release date for these books.