Prequel

 The Girl with the Make-Believe Husband by Julia Quinn

This was exactly what you expect from a Julia Quinn novel: romantic and funny. Cecilia shows up in New York looking for her brother, Thomas, who has been fighting in the American Revolution. When she gets to the hospital she doesn't find him, but instead finds Edward, his best friend. However, she isn't allowed to see him until she declares that she is his wife. He wakes up and has lost his memory, which is good for her since they aren't actually married. Once he recovers enough they move into a room above a tavern and there's only one bed. They consummate the marriage. He starts getting his memory back. He discovers that Thomas is dead and that he's not actually married to Cecilia, but he loves her so it's complicated. She books passage on a boat heading for Ireland. He manages to get reassigned so he can go with her. He confronts her on the boat. They get married by the captain, who just so happens to be an old school friend of his. And then to be safe they get married again in Ireland. Despite the fact that I hate secret keeping as a plot device, I really enjoyed this book.