Guests are called to a remote island off the Irish coast to celebrate the wedding of the year - the marriage of Jules and Will. Everything has been meticulously planned, the scene is set, old friends are back together. It should be the perfect day. Until the discovery of a body signals the perfect murder. A groom with a secret. A bridesmaid with a grudge. A plus one with motive. A best man with a past. It could be any, it could be all... But one guest won't make it out alive.