Bailey Summers is an awkward, slightly eccentric girl forced to move with her little sister to live with her Aunt, while her parents are struggling to continue their marriage. She is quick to assume that her stay will be a boring one, but when she discovers Alec Montez, a secretive and compelling boy in her year, bleeding almost to death with a gunshot wound, she realise's maybe things won't run so smoothly. Little does she know that sooner or later, Bailey will be thrust headfirst into the terrifying world of spies, betrayal and jealously . . .