When the wedding of super star Lara Tyler (Alice Eve - Bombshell) to tweedy English author James Arber (David Tennant – Doctor Who) is sabotaged by paparazzi, they decide to relocate the event to the one place where the world’s press won’t find them: the sleepy Scottish Island of Hegg. But when their secret location is revealed, they devise a plan to use a decoy bride and think that local girl Katie (Kelly MacDonald – Line of Duty) will be perfect for the job. But when James meets Katie, tempers fray, dresses get ruined and love gets complicated. Can an ordinary girl fill the most famous shoes on the planet?