The Man with a Gingham Shirt

Mia and Kaspar are sister and brother who cannot stand each other. In Mia’s opinion, Kaspar is a baby — completely useless when it comes to doing anything sensible. Kaspar, on the other hand enjoys annoying Mia and then running to their parents for support when she gets cross. Mum and Dad have tried everything, but nothing seems to reconcile the squabblers. How are we going to survive the summer holidays? they wonder.

Then, one day, the children spot a suspicious-looking man in a gingham shirt behaving oddly in a shop. Their shared curiosity forces them to bury the hatchet but for how long will the truce last?