Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
Though Geralt avoided politics like the plague, there were times when he simply couldn't avoid getting entangled. This was very much the case when Roche and Dijkstra convinced him to find their co-conspirator. The man had gone off undercover to resolve a certain matter among the Nilfgaardians and simply disappeared.
