Sally goes to visit her grandfather - and finds a small red dinosaur in the garage. Her grandfather doesn't know about the dinosaur because he isn't quick enough or lucky enough to see him. The dinosaur gets up to all sorts of tricks, like twirling round on the washing line or spinning on the garden sprinkler, but he always manages to avoid being seen by Grandad...just! Young children will love the element of naughtiness in the dinosaur's antics, and giggle along with Sally at his entertaining acrobatics.