Time travel _ in your dreams

The twins Sam and Ben Hazelton from Sydney, Australia, are shocked when their parents announce that they are all going to emigrate to Europe for four months: in Germany. They spend the summer with their eccentric, aristocratic relatives, the von Hasenburg family, who live in the remote German Schoneburg Castle. The family fortune has dwindled to almost nothing so Sam and Ben must help them save the castle and turn their fortunes around before bankruptcy descends and centuries of von Hassenburg entitlement comes to an end.