The Sea of Monsters and The Titan's Curse by Rick Riordan
But when you're the son of a Greek god, it happens. And now my friend Annabeth is missing, a goddess is in chains and only five half-blood heroes can join the quest to defeat the doomsday monster.
Oh and guess what. The Oracle has predicted that not all of us will survive...
I'm going to keep this quick and combine my thoughts on both book. I'm afraid to give too much away if I do it any other way. Really enjoyed them both. My daughter has decided I need to read all of the books in this series - including The Lost Hero series BEFORE the next book comes out in the fall! She has read and loved them all. So now I'm three books in. I love the Percy Jackson books. They've got action, great characters, tension and some humor. As a teacher I also recommend them to my reluctant readers because of all of that. What I also like is that, for me at least, they are quick reads. The stories keep moving along with little down time, so I find I can zip right through them. I also like that each story has definite action and a problem that needs to be solved, but it's not dragged on and on. I'm the type of person that likes the action of solving the problem but when they keep getting close to solving it, then don't, then close, then don't - etc - I get super annoyed. These books do NOT do that, and I appreciate it!
As the series is going along I can see how it's building to a big conclusion. Each book is adding to the pieces that will fall in place during the last book in the Percy Jackson series. This is making me excited to see how it will all play out!
In short - love the series. Everything is solid about it from the characters to the Greek stories to the way the plot unfolds!