The Savage Sword of Conan #87

Queen Taramis promises she will bring Valeria back to life if Conan escorts her niece on a quest. Jehnna is to retrieve a key to a treasure that only she can unlock. The key is in a castle guarded by Thoth-Amon and along the way Jehnna is spirited away to his castle. But Akiro shows Conan's band a secret entrance to the castle. Conan kills Thoth-Amon and Jehnna acquires the Heart of Ahriman.