The qualities of the stories are simple. Mistakes, redemption, pure of heart, honor, etc.
The movie opens with a ship heading to a city. On it is Roscuro the rat. Wearing cloths and an ear ring he looks forward for the famous Soup of the day of the kingdom of Dor. Wandering through the city he accidentally finds himself in the royal hall as the royal family are first to try the soup. Too entranced with the smell; Roscuro falls into the Queens soup and she is shocked to see a Rat, suffers a heart attack and dies. The guards chase him and he eventally falls into a drainage where he lands in Ratworld. There he is discovered by Botticelli who befriends him and decides to teach him the proper ways of being a Rat.
The grieving king then declares no more soup and rats are outlawed and any who harbor them will be punished.
Despereaux is born in mouseworld. He is not a typical mouse. Smaller then normal and he has over-sized ears. What's worst is that he doesn't cower, run, and he likes to take the cheese from mouse traps. His parents are called into school and told he is about to fail since he does not cower from knives and he draws pictures of cats. Even names one fluffy. The school master suggests that Despereaux follow his brother who graduated and was a proper mouse and could teach by example.
They head off to the library where Despereaux is supposed to eat books but instead he starts reading them and learns about knights, honor and questing to save the fair princess. This eventually takes him to the Princess Peas room where he befriends her as she is curious by his gentlemanly ways.
Eventually, Desperaux is found out and he is punished as he has gone too far by talking to a human.
He is sent to Ratword where no mouse ever returns. The rats find him and toss him into a Colosseum where he is to be sacrificed to a cat.
Roscuro notices him and sees that he is different. He decides to save him by declaring he wants to eat him. Botticelli, leader of the rats, agrees as he had been unhappy with Roscuro since he was refusing to eat flesh.
In Roscuro's room, Despereaux tells Roscuro about knights, chivalry and his quest to save the princess. Roscuro recognizes the princess is the very girl whose mother he caused to die and decides to help as he may get a chance of redemption by telling her he is sorry.
I could go on but I don't want to completely spoil the film. Overall I liked the film as the hero really doesn't solve all problems. It's more cause and effect that guides the story. The actions of one affect another. Happiness is lost and as the narrator says a hero appears when most needed. Despereaux is the hero and he actions effects others and causes actions which cause the return of happiness.
The cast is excellent. Sigourney Weaver does a great job as the narrator. Matthew Broderick as Despereaux and Dustin Hoffman as Roscuro. Emma Watson as the princess(though I must admit I thought was Emily Watson). Tracey Ullman as Miggery Sow. Kevin Kline as Andre the soup master. Ciaran Hinds as Botticelli(though I must admit I thought Peter O'Toole would have been better).
Visually the film is beautiful and the music adds to experience in the right ways.
Violence wise it's pretty safe. There is fighting but you don't see things like stabbing, etc. It can be intense especially with the Rat chases and the rat gladiatorial scenes but it's not too bad. My girl is sensitive but she only wanted a little comfort but she still kept her eyes on the screen.