First day of summer vacation and Gimme A Call had been enticing me for a few weeks. I have often wondered what I would change in the past if I could and this book takes that premise and runs with it. I was sucked into the story, waiting to see what would happen next and ended up finishing it in one day. Not bad when I was playing with the kids from 6 am to 7 PM. The writing style was accessible and there was nothing too mature in it, which is why this can be recommended for fifth and up.