This trilogy ends with a bang. Having stumbled upon a way to travel through time, Johnny knows exactly when a German bomb will be dropped on his English village. Time travel turns out to be tricky, however, as it takes Johnny and his friends several trips to alter history just enough to save their town, but also to ensure that everything stays the same when they return home. Adding to the suspense is the imaginative vehicle of a crazy bag lady's squeaky cart to time travel, often with unpredictable results. The climax is reached at rocket speed as Johnny becomes increasingly aware of the many dimensions of time and ultimately relies on this ability to save the townsfolk.