"King Graham has suffered a heart attack and is on the brink of death. The good fairy Genesta contacts Rosella through the magic mirror and offers her assistance. Genesta teleports Rosella to the land of Tamir, where she learns about a magical fruit that can heal her father.
However, Genesta herself is in a weakened state because the evil fairy Lolotte stole the talisman that gives Genesta power. If Rosella cannot return the talisman to Genesta, the good fairy will be unable to help her return to Daventry in time to save her father. So in addition to finding a way to obtain the magic fruit, Rosella must win Lolotte's trust. She is charged with performing three tasks for the evil fairy, after which she has the opportunity to recover the stolen talisman."
Source: Wikipedia, "King's_Quest_IV:_The_Perils_of_Rosella," available under the CC-BY-SA License.