This is a Lot of 4 Historical Romance books by Lisa Kleypas:

Worth Any Price, 2003: 1st edition with Stepback Cover, cover is starting to separate where the Stepback is, corner edges of book are bent

Again The Magic, 2004: 1st edition with Stepback cover, considered a prequel to the Wallflowers series

Lady Sophia’s Lover, 2002: 1st edition with Stepback, part of the Bow Street Runners series

Love, Come to Me, 2011: Reprint of 1988 novel, front cover corner edge ripped

See photos for more details.