Emma and her friends are about to turn thirty, 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, or snogged anyone famous. As Emma hurtles towards her thirtieth, she discovers, with hilarious consequences, that some of them are trickier to tick off than she'd thought...