AND MRS is about Gemma, a woman living in London (BAFTA winner Aisling Bea), whose American fiancé Nathan (Emmy-nominee Colin Hanks) dies shortly before their wedding day. When, with some encouragement from her sister-in-law (BIllie Lourd), she decides to go ahead and marry him anyway, she has to overcome public opinion, the law of the land and even her own family's objections.