The trouble-solving trio are at it again The twins, Isabella and Jessica, and their friend Edward have been invited by the crown prince to stay in his castle in Newland, for their half-term holiday. The three friends look forward to a week of exploration and fun, but the holiday does not turn out as expected. The king is ill, a royal relative is ruling Newland in the king's absence, dignitaries from other countries are arriving for the opening of the huge nature conservation, and the friends stumble across strange goings-on. The friends must find out if disaster is looming for the crown prince and the king of Newland. Isabella, Jessica and Edward will need the help of their dogs and modern technology. Gear up for another exiting and entertaining adventure with the three friends, and a couple of new ones. The Castle Adventure is a fun story that should appeal to boys and girls, ages 8-12.