Melanie and Fran are horrified when their ruthless former schoolfriend Amanda announces that she is marrying a wealthy Scottish laird. Convinced that the match is a disaster - and carrying complicated feelings of their own - the two London friends set out to interfere with the wedding. Their schemes draw ex-boyfriends, family grudges and romantic confusion into an increasingly chaotic weekend. What begins as sabotage becomes a sharp, comic test of friendship, jealousy and whether anyone truly knows what the bride wants.