When Iwan, Mair and their friends spot a stranger in the empty house near the park, they know at once that something’s amiss. He must be a thief, and they need to hatch a plan at once to catch him. Join the friends on their summer adventure!

Grandad's words ring in Alun's ears every time he does something wrong or doesn't do it the way Grandad used to do it. But then, suddenly, Alun is transported bach through time to the year 1960, when Grandad was his age. This is his chance to see how Grandad lived.