[X] Investigate the omens and portents that brought Catelyn and Hoster together if indeed they were real and not rationalization of their feelings. -[X] Step one of this process would be the simplest. If Catelyn has had her memories of that time manipulated in anyway, by the auspices of one conspiracy or another, you can restore those with a single Miracle. Ask for her consent of course, though beforehand getting as close an account of what happened that night in the countryside as she can provide, straining her mind for accuracy. If there's any discrepancy, the spell would break through any modification you care to name. -[X] If no discrepancy exists, try to thread backwards in another direction and see who might want to attempt Brynden's more subtle brand of manipulations by using details she's provided. -[X] Perhaps make use of the spell Hindsight using Wild Arcana?