Do I need to read the Unexpected Brides series in order? Or can I start with the third book?
They were all designed to stand alone in case anyone picked them up out of order. However, you do see old characters pop back up in the story, so if you intend to read them all, I'd go in order: Love by the Letter (ebook only), A Bride for Keeps, A Bride in Store, A Bride at Last. (There's also a side character from Love by the Letter in The Convenient Bride Collection in my novella titles Blinded by Love.)