Kill Switch — Chris Lynch

All Daniel wants to do is spend one last summer with his grandfather before he moves away for college and his grandfather's dementia pulls them apart. But when his dear old Da starts to let things slip about the job he used to hold -- people he's killed, countries he's overthrown -- old work "friends" show up to make sure he stays quiet. Was his grandfather really involved in a world of assassinations and coups, or are the stories just delusions of a crumbling mind? On the run from the police (and possibly something worse) before he has time to find out, Daniel may have to sacrifice everything to protect his grandfather from those who would do him harm.