Death Of A Travelling Bard

Geralt and Jaskier have a falling-out. This leads to Geralt returning to Kaer Morhen without Jaskier, done with the bard's reproaches and behaviour. In his attempt to get as far away from Geralt as possible Jaskier ends in a dank prison cell, exposed to torture, sentenced to death and awaiting his execution. Geralt only hears of it when it's already too late to save him. Or is it?