Need summary of the book cherub by Robert muchamore?

Cherub is (so far) two series' of books. It's about an organisation (cherub) that recruits children in order to spy on criminals and terrorists as they will never suspect them. In series one the main characters are James Adams, his sister Lauren Adams and their group of friends (this series has 12 books). In series two the main character is someone called Ryan and in this series there is one book out and to more due for release so far