Marnie's really messed up this time - expelled and forced to change schools, the only empty seat in Marnie's new school is next to Zed, a nerd with zero tolerance for mistakes. Marnie (skilled at art and Spanish, struggles with numbers) can't wait to lose her virginity. Zed (brilliant at maths and physics, loathes languages) is a loner who can't stand being touched. They couldn't be less alike, but they both need good grades in the subjects they hate.

What starts as a trade in tuition turns into an unlikely friendship - and after Marnie has sex with a boy who lies about using a condom, she needs Zed's help to make the hardest decision of her life.