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Isabelle is buying supplies at a herbalists store, when she discovers a sealed envelope on the shelves. Her name is written on it.
"My dear Isabelle. It's been a while since we last worked together. My clients have a very simple task for you. You better not keep them waiting."
When the store owner returns from the backroom, carrying the requested herbs, Isabelle is already out the door.
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The Baron has brougth Isabelle to Byers pass for a special demonstration. Another train is under attack by bandits, and Isabelle's task is to eliminate all of them. Every single one. It doesn't get much simpler than that.