Nezznar's Letter

Nezznar the Black Spider sent a letter to Iarno "Glasstaff" Albrek in 2528. It was sent from Cragmaw Castle to Phandalin, being carried by three bugbears who Nezznar sent to aid the Redbrand's cause. The letter informed Glasstaff that the first Fellowship of the Burning Inn would soon be arriving in Phandalin on the Rockseeker's orders. It was signed with the symbol of the Black Spider.

The Letter
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 in haste. I'm counting on you, Iarno. Don't disappoint me.

The Fellowship of the Burning Inn
When the Fellowship snuck into the Redbrand Hideout under Tresendar Manor, Iarno fled before he could be captured. In his haste, he accidentally left the letter behind and it was read by Faygo and Orsic, revealing to them the there was someone orchestrating the capture of Gundren Rockseeker and Sildar Hallwinter and the Redbrand's activities. Although they didn't know who exactly it was, they were on the lookout for the symbol of the Black Spider again.