It's Derry and it's the Hallowe'en break. And Aimee McCourt Logan's cross-border exchange partner (yeah, she goes to that kind of school) Caoimhe is coming to visit. More to the point, she's bringing her dream-god brother Darren with her. Meanwhile, Aimee is trying to keep her co-best friends' lives on track and she's implementing a new health and beauty regime (any day now). Armed with her trusty stack of lists, a hot chocolate and the all-powerful Facebook - and with a little hindrance from her cat, Rainbow - nothing is impossible.