8/10 - Not nearly as good as Lightning Thief but still entertaining, fun and imaginative. There's nothing really bad about it, it's just the plot is a repeat of the last book and it's not as memorable as the rest of the series. Still, Tyson is introduced, mabye one of my favourite and easily the sweetest character in the series, Annabeth and Percy's relationship is at it's best here, and there are a lot of exciting and gripping sequences from start to finish. And, again, the twist at the end with Thalia's tree hooks you right into book 3.