Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
Geralt spent some time walking through the rich farmlands outside of Novigrad. During one such stroll he happened across the ruins of a tower. Whether out of curiosity or because of the throbbing of his medallion, Geralt decided to investigate. It will surely come as no surprise that this investigation uncovered evidence of a monster's presence...
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