Grace’s entire life has been in preparation for her death. She is what her people call an Angel, a person trained to infiltrate the enemy with a bomb strapped to her leg (aka suicide bomber). Some of her fellow Angels feel honored to have this important task to highlight their lives, but not her. She is used to being treated as a second-class citizen of her people due to her mother being among the enemy. Even the boy she is pledged to just before her assignment (because it is always better to die pregnant, thus giving two lives for the people) despises her. So just before Grace turns 17, she is sent off to die, all in the name of freedom for her people.