Hostage

This book is about a kick boxing champion, connor joining a bodyguard agency, Buddyguard. The agency recruits kids as bodyguard, since they are not noticeable as adults. Connor got recruited and went through rigorous training and was sent to a mission. The mission was to protect the daughter of the president. Connor gets equipment, such as a bulletproof T-shirt. They are attacked with a lot of bombs and solders. I can't tell you more, since I will spoil the story, but I highly recommend it.