I need a title for a book?

There is a girl who goesto this school for geniuses/spies. Both boys and girls go there. During the book she goes undercover as extra credit for school but gets captured by this dude who wants her to build this contraption that will help him be more evil and cause catastrophe on the world he asso captures this other boy who also goes to the school... In the end the building is blown up and the main girl is shot... She lives though