It was fine. I had fun. Not much in the way of character development, but there was some for Grover. Also random Sally backstory? That was fun. And lots of wild Hecuba lore. Otherwise just a silly adventure featuring familiar characters and a ton of timeline inconsistencies. Honestly, I would think the book was ghostwritten were it not for the fact that a ghostwriter probably would have kept better track of which characters were alive/had which weapons/etc at this point in the timeline. Or at least would have done some cursory research. Definitely not Rick Riordan's best but I did have fun.