From Riches to Redemption by Andrea Laurence

Her ex-lover is back - right when she discovers her life is a lie.

Ten years ago, Morgan Steele secretly eloped with River Atkinson - only to see her vows betrayed. Now River's back, made good as CEO of a construction company that rivals her family's empire. Forced to work together, they give in to long-suppressed desire. But when Morgan discovers she was switched at birth and isn't the Steele heiress after all, will their second chance be sabotaged by secrets?