Game concept
Scheme Discovery Chance
From the game's encyclopedia
This number is directly deducted from the Secrecy score of any Secret Scheme against you or your Courtiers.
Secrecy is checked when a Scheme is executed, and at a reduced rate once per month.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Scheme Discovery Chance is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "This number is directly deducted from the Secrecy score of any Secret Scheme against you or your Courtiers." It is part of Scheme. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.