Josie Flynn is in New York for the wedding of Martha, her American cousin. Having just been through a messy divorce, she's hardly in the mood to don a lilac bridesmaid's dress, especially when she thinks Martha is about to marry the wrong man. In fact, Josie is all for talking Martha out of what could be the biggest mistake of her life. Which is all very noble, until Josie meets Matt Jarvis and appears to be about to fall for the wrong man herself. And when an ex-husband, an old flame, a dubious boy-band and a seriously determined duck enter the picture, who can tell where it will all end ...