4th&up. 
 Add a star if you're a preteen 
 If you read and loved the Percy Jackson series, especially the first book, The Lightning Thief, this story might sound a bit familiar to you. Carter and Sadie find out that powerful gods inhabit the real world and these formally ordinary kids discover that they have a vital role to play when it comes to maintaining balance between the humans and the gods. 
 So, the story is a bit derivative and definitely patterned after the Percy Jackson series, but it is a damn good formula that Riordan is following- so considering the action, the appealing main characters, the interesting Egyptian mythology (though not as compelling as Greek mythology IMHO) and bits of humor, this book should still be a solid hit with young readers. 
 (I could have done without the baboons- but, hey, that's probably just me).