Rebecca and the Horror Harvest. The Wingless Fairy, #5

It starts with potatoes. Strange ones, planted by magic in the dead of night. When a mysterious stranger pays Miranda a silver coin to use their creek bottoms, Rebecca knows something is wrong. The man wears a veil of illusion. Her house goblins hiss warnings. And Miranda keeps forgetting the whole arrangement ever happened. Then the harvest arrives: plump potatoes laced with poisonous magic. Anyone who eats them becomes ravenously, endlessly hungry.
Hungry enough to do anything the three evil wizards demand. Rebecca may have lost her fairy wings and her magic, but she still has her wits, her loyal owl guardian Lord Be Thankful, and two brave house goblins willing to fight. With the entire district falling under the wizards' control, Rebecca must find a way to destroy the horror harvest before it's too late. Some battles don't require magic. They require courage.