Question: do geralt and yennefer die?
Answer: Geralt is killed in a pogrom in Rivia at the end of Lady of the Lake. Yennefer dies trying to revive him. Ciri, with the help of Ihuarraquax (the Unicorn) revives Geralt and Yennefer and transports them to the Isle of Avallach. The Wild Hunt arrives at the Isle and captures Yennefer.