Zemek is a child who went missing from the Orphans of Crookback Bog.
Zemek was orphaned at a young age during the Nilfgaardian invasion of Velen. Like many children in the surrounding area, him and his brother Genny ended up living under Gran's care at the orphanage in Crookback Bog.
Prior to May 1272, Zemek went missing from the orphanage. According to Genny, Gran cried a lot after the event, and told the other children that Zemek wandered out into the woods and got lost.