User blog comment:Maimer1882/Cliffhanger/@comment-3146930-20120217165309/@comment-3146930-20120217232027

Except Pan reached out to Grover toward the middle of the book, so Pan talking to him again didnt feel that surprising. As far as Nico being a child of Hades, it was surprising but there was a bit of build-up as his sister managed to kill an undead warrior when no one else could. The Titan's Curse IMO had a Twist ending, but not a Cliff-hanger ending. Actually, the Sea of Monsters also had a type of Twist ending. The only one that really had Cliff hanger endings were SoN and The Battle of the Labyrinth