Treasure Island (unofficial)

Treasure Island was a hidden book in the Classic Fiction section of Caldaur's library. A certain number of books had to be pressed in sequence to reveal it. The Child's Key was used to unlock the lock binding its cover shut. On the last page was a map of the castle and the surrounding area which pointed the way to the tiara's location. "A date of fate can be found with a first, a second, and a double of nothing" was written near the bottom.