An Invitation from Keira Metz - The Witcher 3

Geralt and Keira's journey to the elven mage's lair had forged a tight bond between them, the kind harrowing life-or-death experiences forge between soldiers at war or students during exam week. And so when it was all over Keira invited Geralt to stop by her hut sometime, in a way that suggested she did not mean for an afternoon of tea and crumpets.

And indeed she did not - but nor did she mean what you or Geralt surely had in mind. In truth, she had a favor to ask. She wanted Geralt to help her tackle the curse afflicting Fyke Isle.

Though lifting curses is a witcher's bread and butter, this time Geralt abandoned the job before seeing it through to fruition. I'm not entirely sure what led him to make this decision, but I can only assume his inner drive to find Ciri was so strong it would not let him spend a moment pursuing anything else.

The curse was lifted and anyone who wished could now safely visit Fyke Isle - yet Geralt did not return to Keira to tell her about his success. I don't know why he neglected to do so, but I am confident he had his own, perfectly valid reasons.