Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
Information found in the home of Hendrik, the Nilfgaardian agent, indicated Ciri had entered into conflict with some witch in Velen. At first Geralt thought this "witch" was Keira Metz, but he later learned Hendrik had meant a different individual, one who dwelt in Crookback Bog. So the witcher ventured into the swamps, determined to find this bog-dwelling witch and ask her about Ciri.
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