The Terrorist — Caroline B. Cooney

When terrorist violence in London tears an American family apart, sixteen-year-old Laura becomes obsessed with finding her brother's killer.

Laura and Billy Williams are two ordinary American expat kids living with their parents in England. Then, in an instant, everything changes when Billy is handed a mysterious package in a London Underground station . . .

Billy's tragic death leaves a hole in Laura's heart, one that soon becomes filled with anger and a burning obsession to find the terrorist responsible for taking her brother's life. Her search for the truth takes her into dangerous territory, forcing Laura to question everyone she knows and everything she believes.