Quick, fun little novella in which Sadie and Annabeth team up to take down a three-headed monster and a resurrected god. It's fast-paced and adventurous, and the girls work together well although their success ultimately rests on that constant failure of the incompetent antagonist: the need to explain their evil plans to the heroes instead of just smiting them. To their credit, the girls provoke this explanation in order to buy time, which makes me think that Serapis was never that bright to begin with. You'd think a god would recognise a tactic like that, but maybe all those millennia of... non-existence? godly hibernation? ... has dulled divine intelligence.