Cant start this one too...

But maybe theres a little pice to this Puzzle i can add ( I′ll add a list of Stuff about my char at the end of the Post):
Since baiscally the quest starts with Calixto killing Susanna the Wicked i decided to check these two out.
As stated in the first Journal Calixto actually is "prowling" for Susanna.
He leaves his house, every night afa I′ve seen, around 2:00AM and walks to the Northeastern Corner of Windhelms Central Square (the one with Candlehearth in the middle) and seems to wait there till about 5:00AM. Then he returns home.
Calixto states in the first Journal that Susanna has become carefully and that seems to be an understatement

at least for my game at this point...
I sat on her for about 10 ingame days since i figured she would have to leave at one point to actually be able to get killed and maybe she just goes out on sundays to the temple or whatever...well...she doesnt.
She sleeps in the inn in the same bed Nils(who can be encountered walking the streets of WIndhelm) sleeps in
, in the eastern Room of the Groundfloor of Candlehearth.
The rest of the Time she either is cleaning, cooking or partying (claping to a song with a mug in her hands) along with the rest of the patrons.
I tried pickpocketing both of the Protagonists to no avail...apart from Calixtos Chest Key but taking and using that seems to bug the quest even if you are actually on it(as stated above) so nothing to do here.
I checked the console for both their names, Windhelm in generall, cell locations (graveyard seems to be no seperate cell),any connection between the MS11/MS11b(Blood on the Ice Quest ID) and them (none found apart from some dialog for selling the amulet later on to Calixto), connection to the Winterhold College (since its reffered to in one of the Journals), the terms : "killer", "murder","butcher",and got nothing in terms of settings or variables for both of them or the quest.
Tried setstage for MS11Kicker at values 1, 10 and 100. Left Windhelm waited-returned still nothing.
Odd about all this seems to me that Calixto seems to be following a script to "be there" when she leaves Candlehearth at night and she does not...why make him spent all his nights awake and about in town close to the murder scene and leave her completly out of it?
If it is to avoid th Player to stumble upon the murder happening either make Calixto stay hom if the Players in town or make em both wander around without anything happening as long as the Player is there...
My guess at this point is that sha has to leave Candlehearth to start the quest but for some reason her scrpt is broken and so she doesnt.
I tried to lure her out by punshing her in the face and leaving Candlehearth at night but after i yield to the guards she just runs back inside.
I tried the TAI(Toggle AI) console command to maybe reset her but she only freezes mid sentence/motion/place and continues with whatever she was up to after i turn it back on(not that i expected different but worth a try...).
Anywho...Im out of Ideas atm...as promised Char Stuff:
Lvl 44 Dark Elf
Civil War: Stormcloak, did Neugard (nothing more), was offered Thane of Windhelm, 5/5 people of Eastmarch helped before i did Neugard, Thane of Whiterun before Conquering it for Stormcloaks. no other Thane Titles.
Dark Brotherhood : did Gerold the Kind and was "abducted" by Astrid. nothing more.
Main QLine and Thieves Guild: met Brynjolf(?) in Riften and did the first Thieves quest (Steal Silver Ring and get Dark Elf arrested thingy). nothing more (maybe the double quest involvement screws smthin up?).
Arch-Mage of Winterhold College.
Married to Aela the Huntress - Fully upgraded house in Whiterun.
thats all folks...i think...
TL;DR: qq gimme back my life bethesda!
jk^^ love the game! one of the best in some time!
imho things like a game with such an awesome amount of content may actually be excused for having som glitch hrer and there...as long as they come up with a way to fix it

Cheers and thx
Yours truly