Seeking Legendary Book!

Seeking Legendary Book! is the eighteenth Trouble Center mission in Paper Mario: The Thousand-Year Door, initiated by Zess T. It is first available after clearing Chapter 4.

Mission
Mario must head to Zess T.'s house in Rogueport, and she will tell him of a legendary cookbook hidden in Creepy Steeple. Mario must head to the entrance of the steeple and use the Tube Mario ability to enter a secret room, where he uncovers the cookbook in one of the chests. When Mario delivers the cookbook to Zess T., she will reward Mario with a Honey Shroom, and the trouble is solved. From then on, Zess T. has the ability to cook up to two ingredients, as opposed to one.

In-game description

 * "I want you to find the legendary cookbook for me! It's in a pretty scary place, so there's no way an old gal like me could get it alone! Please come to my house in Rogueport Square for details!"