I loved the Percy Jackson series and I liked the Kane Chronicles, so of course I needed to read the crossover stories. 
 Again these two mythologyc worlds collide, but this time its Annabeth and Sadie that meet. It is told by Annabethe's pov, but she has knolowdge about Percy's previous encounter with Carter (Sadie doesn't). They both are fighting some creatures that are trying o merge and create a three headed beast, and they quickly join forces to try to stop a both egyptian and greek god from destroying the world. 
 They also realize someone is behind all these events, but both greek and egyptian gods are leaving it to their hands to find the culprit and stop him. 
 I really liked the story. I love Annabeth, and Sadie was way more fun when she's not narrating. The resolution was a bit "easy" but then again, it usually is in short stories.