They are really cool books, I love them a lot :3 Though I'm bad at book descriptions, so bare with me, ahah
Okay, so the Legend series follows two opposing characters. June is a smart, capable girl who is fortunate to be part of the richer sector and go to a military school. While Day, on the other hand, is a street boy that has a lot of cunning street smarts and is able to escape the law because he's so smooth and quite talented.
The story basically starts when June's brother is killed (not a spoiler, it's on the back of the book) and she has been tasked to find the killer and bring them to justice. The first book is basically uncovering the mystery behind her brother's death and some more stuff which I wont say because I don't want to spoil it.
It's set in a dystopian America where at the age of 10, every kid has to take a test to see where they place. June having good marks was placed on the military track, while others with lower marks get lower forms of eduction, or none at all.
Soooo yeah, that's the roughish background and stuff to the book :3 I wont explain the other two because they're an obvious carry on from the first, and it will definitely spoil it if I do