The next obvious course of action is to question Thonar Silver-Blood. The younger of the Silver-Blood brothers obviously wants the investigation stopped - is there something the Silver-Bloods want to hide?
Expectedly, Thonar is tight-lipped about his involvement - at least, he was until his servants suddenly came at him with daggers... in the ensuing pandemonium, I fought off the attackers and found that Thonar had defended himself as well, but his wife was not so lucky...
The attack had changed things. Fuming over his wife’s murder, Thonar admitted that the Silver-Bloods were connected to the Forsworn.
It began with the Markarth Incident, when the natives - called the Reachmen - rebelled against Nord rule. They were eventually put down by a coalition of Jarls led by Ulfric Stormcloak. Many of the Reachmen escaped to form what would eventually be called the Forsworn. The rest of the rebels that failed to escape were imprisoned for their role in the incident, and the Silver-Bloods made a deal with Ulfric to receive custody of them. These prisoners - including the self-proclaimed king of the Reachmen, Madanach, were then put to work at the Cidhna mine, spplying the SIlver-Bloods with cheap labour for their lucrative mines.
Eventually, the Silver-Bloods found another use for Madanach. They allowed the king to write letters to loyal Reachmen who continue to do his bidding in secret (many harbour a chance to overturn the Nords again, after all). Of those murdered by Madanach's bidding, most were enemies of the Silver-Bloods. All were targeted by messages passed on through the hands of the elderly Reachman Nepos - that must be the "N" on Wyelin's letter.
This recent turn of events at the Silver-Bloods home showed that Madanach had grown confident enough of his power (or at least mad enough) that he dared target his patrons. Thonar had decided to cut him loose, and now thinks to set me on Madanach.
-

