Crookedstar: "Go on then, kill me! I have nothing left to live for!"
Mapleshade: "Oh, no, letting you live is far better revenge."
Crookedstar: "Revenge? What did I ever do to you?"
Mapleshade: "You were always destined to become leader of RiverClan. It was never anything to do with me.Your path was marked by stars countless moons ago.But who cares about destiny except fools?I should have been ThunderClan's leader! But ThunderClan cast me out when I took a RiverClan mate.Familiar,eh? Oakheart isn't the only traitor you know. Our kits were perfect! But they drowned. After ThunderClan cast me out. I tried to carry them across the river to their father's Clan. But the water snatched them from my grasp and carried them away.*Crookedstar tries to wiggle free* "Oh,no! You,must listen to the whole story.Their father blamed me! And RiverClan cast me out, too. Can you imagine what that feels like? To be a loner when all you tried to do was to love? But don't worry, I made them pay. I looked for revenge wherever I could! Why do you think I'm here? I earned my place in the Dark Forest. But what made it worse was that the father of my drowned kits took a RiverClan mate! He promised he would only love me! They had a daughter, and she had a son, And do you know who that son was? Shellheart, your father. Do you see now? Do you understand?"
Crookedstar: "Understand what?"
Mapleshade: "You mouse-brain! My kin should have been the leader RiverClan, not his! If ThunderClan hadn't driven me across the river , my kits wouldn't have died. If RiverClan hadn't rejected me,I'd be their father's mate, not some fish-hearted RiverClan queen.I've endured so much betrayal! So many cats have hurt me beyond measure. And then you came, destined for so much greatness, when you should hve never been born! I wanted to test your loyalty, I wanted to see if you were weak and disloyal as your kin. I wanted to see if you'd betray me like they did. Do you remember what I said? Do you remember my exact words? I can give you everything you ever dreamed of,power over all your clanmates,if you promise to be loyal to your Clan above all other things.And you did! You promised! You chose to sacrifice every cat you ever loved. Your mother,your brother, your mate, and now your own kits : From that one promise, I could take them all!" - Crookedstar's Promise, pages 479-481
Mapleshade was a villain in Erin Hunter's Warriors book series.
When Stormkit falls and breaks his jaw running away from Goosefeather, he sees Mapleshade though she is not named. She tells him that it is not his time to die yet as she looks down at him through the river and disappears. Later when Stormkit, now Crookedkit tries to run away from RiverClan she tells him that he should go back home.When Stormkit becomes Crookedpaw, Mapleshade tells him that she can give him everything he every dreamed of if he promises to "put his Clan above all else". So Crookedpaw makes that promise,but what he doesn't know is that Mapleshade is plotting revenge against Crookedpaws family and she kills everyone Crookedpaw every cared about, preventing him from saving them by reminding him of his promise.
Crookedpaw eventually becomes leader of RiverClan and that's when Mapleshade reveals that she is a villain, telling him about her past and why she wants revenge. She later kills Crookedstar's mate, Willowbreeze and Crookedstar snaps, yelling at Mapleshade telling her he takes his promise back. The last time Crookedstar sees Mapleshade is in The Dark Forest, where she tells Crookedstar that his punishment is complete and she has destroyed him, but Crookedstar tells her that he has his family and friends waiting for him in StarClan and that she has "nothing, no one".