It is 1987 and Jenna is a 13-year-old girl on the brink of womanhood. The problem is that adulthood is just not arriving fast enough! She's suffocated by her dorky parents, ignored by the hip kids in school and the cute guy she has a crush on barely knows her name.

No longer content to spend time only with her best friend and neighbour, Matt Flamhaff, Jenna invites the cool kids to her 13th birthday party which turns into a disaster. Jenna is humiliated when she's locked in the closet for a game of 'Seven Minutes In Heaven' and everyone deserts her. Alone in the closet, Jenna makes an earnest wish. If only she could be all grown up, she'd have the life she's always wanted...

The next day, when Jenna emerges from the closet, it's 2004 and she's 30 years old. What's more, she is a gorgeous successful woman with a great job and a fabulous Fifth Avenue apartment. She is finally cool and popular. The only hitch? She has absolutely no idea how she got there! Initially frightened but gradually enchanted by her new life, Jenna soon realizes there's something missing--Matt. When she looks him up, she is horrified to discover that she and Matt are no longer in contact and, furthermore, he is engaged to be married. Jenna learns that 'having it all' is not enough and decides to take a second chance at first love...