A mouse was born and they named him Despereaux. Despereaux's family didn’t like him because he was different, he was much smaller than an ordinary mouse, his eyes were open at birth, and his ears were larger than some of his family members and larger than a newborn mouse’s ear. Despereaux was also unordinary due to his odd behaviors. His siblings tried to teach him a mouse’s way but Despereaux didn’t change his odd behavior. His sister brought him to the library to eat the pages but he read instead.
Despereaux was in the library when he heard a sweet sound. He followed the sweet sound to where he figured out that it was the king playing his guitar to his daughter, Princess Pea. Despereaux soon was spotted by the princess and exposed himself to humans by getting closer to the sound. But Furlough, Despereaux's brother, had seen his brother Despereaux, interact and expose himself to a human which was a very important rule to not ever do. So his brother snitched and told their father about how Despereaux broke the rules and so his dad called the mouse council.
Roscure saw light once and so he had been searching for light for a long time but this rat named Botticelli tried to convince Roscure to torture people instead because that's what rats do. So he did but he found no joy in doing so. So, Roscuro decided to go out of the dungeon where he saw light. Once he was there he climbed up the chandelier but soon fell after he was caught by the princess. Roscuro fell right into the queen's bowl of soup and the queen died from shock so Roscuro ran away and plotted for revenge. The king also demanded that all of the things that are related to soup, be banned in his kingdom because the queen died when eating it and was also the queen's favorite food.
Miggory's father sold Mig to a man, the man forced her to work or else she would get clouts to her ear. One day she saw the princess riding her horse with her parents and knights and ever since that day Mig wished she would see her again and be a princess too. Then one day a knight from the castle came to retrieve all the things related to soup because of the king's order. The knight found out that Mig was sold to the man and being sold to someone is illegal in the kingdom so the knight brought Mig to the castle to work as a maid which had better treatment.
Mig was brought to a castle and worked as a maid, she was given multiple chances to do her job but she couldn't do anything right. Mig didn't even kill the mouse ( Despereaux) in the kitchen, Mig only luckily cut Despereaux’s tail. Since she couldn't do anything right she was given a final chance at doing her job right and so Mig went to feed the prisoners in the dungeon. While she was down in the dungeon, Roscuro told Mig his evil plan and Mig agreed because it would make her become a princess which she had always wanted. But Despereaux heard everything because he was wrapped into a napkin by George for him to get out of the dungeon, which was on the tray that Mig was holding while Roscuro was telling her his plan.
Roscuro and Mig began there plan. At night the two brought a knife and a candle, and together they headed to the princess’s room, Roscuro hid in Mig's pocket as they were walking up the stairs to get to the princess's room. Rocuro told Mig to wake the princess up and forced her to come with them to the dungeon. Roscuro also told the princess to wear her shiniest dress and her shiny crown. The three of them walked to the dungeon before everyone woke up.
When everyone woke up they were devastated to find that the princess was missing. Luckily Despereaux heard their plan and so he took action. First, he warned the king but the king didn't believe him so Despereaux grabbed his supplies (needle+spool of thread) from the thread master and headed down to the dungeon after he was spared by the cook and tried soup the cook made even though it is banned by the king at the time.
Despereaux lost his spool of thread because it rolled down the dungeon stairs, but he bravely went down the stairs leading him into the dungeon. Right by the stairs was a rat named Botticelli. Botticelli told Deasperueas he would bring him to find the princess who's in the dungeon about to be cuffed up. But Botticelli true plan was for him to see the princess in a desperate state so Despereaux would be sad and then Botticelli would eat him. On his way there Despereaux saw many mouse bones and fur on the ground and multiple rats came and wanted to eat him too.
Roscuro told Mig to cuff the princess up but the princess convinced Mig, so Mig wanted to kill Roscuro but Rocuro was the only one who knew how to get out of the dungeon because the dungeon was like a maze and multiple people already died because they were lost and died of hunger. Later Despereaux arrived and pointed his sword (needle) at Roscuro and Roscuro reatreated and realized what he did wrong and admitted he only wanted a light of his own in the dungeon since the princess was like a bright shining light. Despereaux wanted to kill Roscuro but due to the princess who had a kind heart, the princess told Despereaux to spare him. Roscuro showed them out of the dungeon and Mig got reunited with her father, Roscuro was granted access to the castle other than the dungeon, and Despereaux and the princess became better friends.