Does this sound like something folks would want to play? (Goblin Market is probably too generic so just a working title) Each adventure would be a one-shot in a new Victorian city/village with a new target to corrupt.
In The Goblin Market the players take up the part of the goblins striving to tempt the good folk of the world into sampling their wares. At each stop the leader imparts the players with a target to entice. These unsuspecting victims range from a stalwart resurrectionist to a righteous barrister. Each with their complications and weaknesses.
The more people they corrupt the weaker the veil between our worlds becomes until the two merge. A twisted reality from the most disturbed Victorian fairy tales. But, beware, there are sworn enemies who know the true motives of the goblinkind. Hunters, zealots, and the vengeful are all dangers most fatal.
It is up to the players to navigate these treacheries and beguile their target without giving away the location of the Goblin Market.