Here is a Powerpoint that I wrote a few years ago to help students learn how to summarize a narrative. It introduces students to the bad strategies that they may have picked up, explains the characteristics of a good summary, and then has them choose the best summary to the story "The Very Hungry Caterpillar".
Why this really simple book? Not only is it widely available and easy to track down in just about any school, but it has lists to collapse and is a quick, engaging read.
As I prepare for state testing this week, this presentation will be a nice review. Then, students will practice summarizing with the story "Goose in the Blackberry Patch" from our state's released sampler items.
You can find Pennsylvania's testing samplers here. Many of the stories and nonfiction pieces are nicely written and can be useful in the classroom even beyond test prep. "Goose in the Blackberry Patch" can be found in the grade 4 2005-2006 reading sampler.