Hero Fenster is nothing like her name. Shy, bookish, living in the shadow of her flirtatious younger sister Juliet, Hero has only one secret. She is in love with Arthur Watterly, heir to a dukedom and an Arthurian scholar. Unfortunately, Arthur's family has had an understanding with another young woman's family since his birth and he is soon to be formally engaged. Fortunately, the search for the original manuscript of Malory's Morte d'Arthur finds them both locked overnight in a bookshop attic and thoroughly compromised into marriage. In the quest to find the manuscript, and the mysterious note-sender who is threatening them, they also discover a once and forever love.