Letter to Glasstafs

You found a letter signed with a symbol of a black spider
Lord Albrek, My spies in Neverwinter tell me that strangers are due to arrive in Phandalin. They could be working for the dwarves. Capture them if you can, kill them if you must, but don't allow them to upset our plans. See that any dwarven maps in their possession are delivered to me with haste. I'm counting on you, larno. Don't disappoint me.