I posted a while ago about my plans to run a campaign consisting mostly of Season 4 Missions and 5th edition adventures that go well with it, culminating in Shattered State as the finale. I read a bunch of really cool adventures to use, but I really need to pick one to start with, as I'll probably need it this Sunday.
The 3 main contenders are the ones listed above. All 3 of them seem like appropriate places to start from a story perspective, not least because all of them do a good introduction to the Orc Underground, and, from what I understand of these really are adventures that belong(ed) at the start or before season 4.
Back in Business is obvious: it's the first adventure of Missions Season 4. The big, big, major downside is that it's all in SR4 rules, so I'd have to start right away with conversion, and I'd rather not do that. However, the big upside is that it links to the Earthdawn experience this group already has (I'm pretty sure the players will recognise the obsidian shard for what it is). Also, it's a good intro for both the Orc Underground storyline and the Artefacts storyline of Season 4. I plan to focus on the Orc Underground storyline, but if the players are far more interested in the artefacts, starting here makes it easy to switch.
I haven't read anything else from the artefacts storyline yet, but it sounds like it involves Lofwyr and Lung, and originally (now long ago) I was planning to have this campaign work towards a dragon-related plot of my own devising. Maybe Back in Business and the Artefact storyline would help with that, although I've kinda abandoned that idea for now.
Copycat Killer takes place before season 4, so maybe it makes more sense to run that first. Big advantage is that I can probably use many of the stats from Carbon Copy, which is basically a remake of this, so much less conversion work. I really like this adventure. Only real downside: I feel like they should have known McCallister for a bit longer before they get called by him for something so personal. Also, seeing him broken will be much more effective if they first know him happy.
Ashes from Sprawl Wilds is also a nice intro to the Orc Underground, but it takes place after Season 4. Of course I don't have to let that stop me. But I also read on some forum that Ashes from Sprawl Wilds is actually a reworked version of an older never-published mission by the same name. And in fact, Back in Business refers directly to the fire in Ashes. So it makes sense to start here if I manage to rework it to fit better before season 4.
Sadly, the original Ashes seems to be completely unavailable. I will have to make my own guesses about the differences. One thing that strikes me is that in Ashes, Knight Errant has an agreement with the Orc Underground/the Skraacha to take over some systems in case of emergency. This sounds pretty unlikely pre-prop 23. Does anyone have any good ideas on what I should change about Ashes to better fit it before season 4/prop 23?
So 3 good paces to start, and they all have good reasons not to use them as the first adventure in this series.
I think Ashes first makes the most sense. I believe it doesn't have Tosh Athack yet? All the others do. (I fear they might be either best buds or mortal enemies with him by the time we reach Shattered State.) But without the original Ashes, it's hard for me to decide what I should change about it.