normaly you should be able to enter his house the first time WITHOUT any key. You chat about the plauge... and he leaves. Then you should be able to enter the house with the key (or lockpick lvl 2 i think). And use the lanterns as keys for the doors inside.
these are the sequense for the lanterns
*****spoiler****
![[Linked Image]](http://kiya1.bei.t-online.de/images/Div_Elrath.jpg)