Lord Archibald Cambury, Marquess of Camburton, has never wanted for anything…except normalcy. Although he adores both of his loving mothers, and his vivacious twin sister with her two husbands, he wants a wife. One wife. Full stop. Is that so much to ask?

Miss Selina Ashby appears to be everything Archie has always wanted in a marchioness: demure, soft-spoken, and pretty, with a quick mind and delectable humor. Yes, she is a bit forward, but he chalks that up to youth. Yes, she has a very particular friend in Beatrix Farnsworth, but he chalks that up to loyalty. He is a lord; she is a lady; they are in love. And so they marry. That should be the end of it.

But when Archie discovers that his wife is as passionate with her particular friend Beatrix as he is with his particular friend Christopher, his world is shattered. He must decide if Selina's love is big enough for both of them — and whether normalcy is truly more important than the love he feels for both the man and the woman who have become so dear to him.