Getting back on topic, I thought it might be Malissa who was the injured party (from the NPC conversations), but it's a man. (Capt. Johne? I doubt it, but who knows).
But Sutek and Malissa and now this man must be the 3 that left (one being injured), and Dexter must have Kotor's notes and be in hiding. So that gives us at least 2 sets to look for.
I traveled most of the southern Isles on GL Trammel, using cont/shift all the way looking for objects, and didn't see anything.
I've also been through the Hedge Maze (hint from the Purple Turtle Medusa) and didn't see anything, although I don't know how to get into the Tower now. But cont/shift didn't reveal anything. I walked most of the maze, nothing except some new things (bridges).
I also checked the Star Chamber, since Sutek a was star gazer. Nothing new there.
Of course, I might have missed something, but I tried to be thorough.