Okay 
 Norse mythology is a LOT more complicated and messed-up than I thought it was. 
 This book was a lot of fun to read! It's a lot like the PJO series - Magnus (rhymes with swag-ness) (did anyone get that reference?), a homeless 16-year-old figures out he's Frey's son. Frey's the norse god of summer and healing and wealth and growth. He dies, becomes an undead-warrior, and goes on a quest. Both of them are funny and witty, with a similar sense of humor. 
 They would either be best friends or kill each other. 
 Magnus has the best group of friends! Sam(irah) is a lot like Annabeth. She's from Iran (or Iraq?), and is from a traditional family, but is the daughter of Loki. 
 And then there's Hearth and Blitz. Hearth is a deaf elf who taught himself magic. He's really sweet, and may be one of my favorite characters. Blitz is a dwarf with... a certain stubborn character, who's really into fashion. Best friend pair i've read about in a while! 
 I loved the PJO cross-overs! so many little hints and nudges towards the series! 
 Magnus himself is awful at fighting, but has awesome magic! And, his sword, 'Somervanger' (aka Jack), talks and attacks on it's own! Super convenient, even though it ends up making him as tired as he would have been if he had done the attack himself... 
 Anyway, I'm so sorry this is so short, just know that I really loved this! 
 4.5 feathers!