The Duke is Back by Valerie Bowman

A wedding is in her future
Miss Sophie Payton might be engaged, but she’s not in love. The only man who ever captured her heart was Phillip Grayson—a soldier who was slain a year ago. But when her stepmother decrees that Sophie will marry Phillip’s cousin, the new Duke of Harlowe, Sophie’s in no position to refuse.

A funeral is in his past
The ton thinks Phillip Grayson died a hero on the battlefields of Europe, but he’s very much alive. While he spent the last year recuperating from his grave injuries in secret at his friend’s estate, his brother was murdered, his cousin took over the title of duke, and the woman he loved—the one he dreamed of every night—apparently moved on without him.

But the duke is back
Phillip has returned to London intent on reclaiming his brother’s title and making the people who killed him pay. He doesn’t understand how Sophie could have betrayed him; she can’t forgive him for letting her believe he was dead. And yet neither can deny that the attraction between them burns hotter than ever. Nothing is as it seems, but perhaps the truth can save them…if it doesn’t kill them first.