What would you do if the one that got away turned up the night before your wedding? Audrey is marrying Josh; steady, dependable Josh, the love of her life. They share a flat and a bank account, and it's the only relationship that Audrey's ever had that feels like something she can put her trust in. But romance should be full of fireworks, and as the big day approaches, Audrey's found herself wondering if Josh really is 'the one'. So, when Josh's sister Miranda arrives at their rehearsal dinner with Fred - Audrey's 'What If?' guy, the man she met six years ago and had one amazing day with but never saw again - Audrey can't help but see it as a sign. Surely Fred's appearance the night before Audrey is due to get married can't be a coincidence. And when everything that could go wrong with the wedding starts to go wrong, Audrey has to wonder: could fate be trying to stop her from making a huge mistake?