This article serves as a guide to the optimal scenario route with minimal spoilers. It only refers to events that involve choices with a significant impact on the story.
The War Orchestra Edit
The Streets of Vienna Edit
The Hotel Edit
Stay the night in a hotel. Go out on the streets if you like, but be sure to eavesdrop at the bar for a new route.
To the Ruins Edit
The Train Edit
Select the new route the next day. Show the guard the stolen item, and insist you know how to use it.
When the train stops, get off it. Upon meeting someone new, offer him the stolen item.
Optionally, get back on the military transport to Istanbul to uncover more information. On the way there, go into the corridor and steal an automaton's cube if you want to gain the favour of the Sisters of Didacus.
Another Meeting Edit
Near the end of your journey, go to Lisbon and explore to see someone in particular once more.