Emma and her friends are about to turn 30, and for Emma it's a defining moment. Defined, that is, by her having achieved none of the things she'd imagined she would. She's never jumped out of a plane, hasn't met the man she's going to marry and has never slept under the stars - just some of the aspirations on a list she and her friends compiled 15 years ago. As an endless round of birthday parties sees Emma hurtle towards her own 30th, she sets about addressing these issues.