Boardgamegeek https://boardgamegeek.com/boardgameexpansion/67208/arkham-horror-lurker-threshold-expansion
English - The Lurker at the Threshold is a boxed expansion set for Arkham Horror, the classic cooperative board game for 1-8 players, set in a world of gothic horror created by author H. P. Lovecraft. This expansion will bring new levels of dread to your table top, with the addition of a brand new Herald Sheet for "The Lurker at the Threshold"