Spoiler
... and woke up in the mysterious house, Astrid was there and wanted me to kill at least one of the 3 guys there.
Instead, I killed Astrid and then, after I got free, someone told me to go to some guard guy. He told me the keyword for their house so I went there.
I killed everyone and now there is no more Dark Brotherhood. But I still want to do the questline, is there any way (PC Console ?) to bring them back to life?
Instead, I killed Astrid and then, after I got free, someone told me to go to some guard guy. He told me the keyword for their house so I went there.
I killed everyone and now there is no more Dark Brotherhood. But I still want to do the questline, is there any way (PC Console ?) to bring them back to life?

(Tv series), and investigate your victims before you kill them to make sure they're the bad guys (or the right target at least).