Here is an epistolary picture book with a T. rex in a role similar to that of the mouse in If You Give a Mouse a Cookie.A little girl is turning six in two weeks, and she's decided to invite a Tyrannosaurus rex to her birthday party! Her invitation entices the huge carnivore with promises of fun games to play, the extra-large cake her mother will bake, the goody bag he will get to take home, and, most important of all, how she will be the happiest girl in the world if he comes. But will he?Lisa McClatchy's sweet, persuasive text is perfectly complemented by John Manders's endearing Tyrannosaurus rex, who can't quite fit under the birthday-party tent or blow out the candles without making a huge mess but is sure to make this birthday party-and this book-unforgettable!.