The Academy (Steel Trapp Book 1900)

Steven "Steel" Trapp has been placed in an East Coast boarding school for gifted kids by his FBI agent father. He soon discovers that there's a clubby element of the faculty and upper classmen that is very secretive and protective. To his surprise, his friend Kaileigh arrives at the school, and it isn't long before the two realize that this is not your normal boarding school. It seems a select few students are recruited, while still minors, to serve as special "translators" for the US Government.