The coordinates closest to one of Thorne's riding trails would be the area southeast of Castle Thorne, towards the forest. Once there, they'll find similar signs to other locations regarding withered plant life.
They'll also find the horse Mat was riding wandering lost in the woods. While the horse is unharmed, any rations or food in its saddle has rotted in a manner that is much more extreme than natural causes. A particularly large larval worm will crawl out of one piece of cheese or fruit.
If they bring the worm back to Castle Thorne, they can examine if it has any link to where the others may be held, or if the information will aid them later in recovering the Lost. They can attempt to keep it alive to see what the larva will transform into, or they can cut it open to see if there's anything inside.
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They'll also find the horse Mat was riding wandering lost in the woods. While the horse is unharmed, any rations or food in its saddle has rotted in a manner that is much more extreme than natural causes. A particularly large larval worm will crawl out of one piece of cheese or fruit.
If they bring the worm back to Castle Thorne, they can examine if it has any link to where the others may be held, or if the information will aid them later in recovering the Lost. They can attempt to keep it alive to see what the larva will transform into, or they can cut it open to see if there's anything inside.