Joe can't believe his luck when his dad rents a castle for their Easter holidays - but is devastated when the trip is cancelled. Determined to have his holiday, Joe develops an elaborate plan to go with his friends instead. The castle is everything the friends had hoped for, and when they discover an ancient box, containing a 200-year-old notebook and an incomplete treasure map, the race is on... 8+ A new case for the 'After School Detective Club'!