I've just started the Morthal quest "Laid to Rest", and can't get past the first hurdle. Investigating the burned out house reveals nothing and no-one at all... I have no quest marker, either.

According to the wiki there should be a ghost there called Helgi. Anyone else had this, and know what causes it or any way around it?

That sounds like a bug--what platform are you playing on?

PC... And I may well have done the old 'enter the dungeon before starting the quest' thing, not realising I was gate-crashing a future quest.