The Prince's Wallflower Wife — Emily E.K. Murdoch

A royal, marriage of convenience story marks the final instalment in USA Today bestselling author Emily E K Murdoch's The Wallflower Academy series. 

Promised to one brother, 

…destined for another! 

When Prince Christoph discovers that his nefarious brother is planning to wed wallflower Daphne, he steps in as the groom! He will do anything to keep his sister safe, and Daphne's wealth can provide his sister a new life out of his brother's reach. But before long, Christoph discovers that his convenient wife's shy temperament hides a resilient heart that is as enchanting as her beauty… As their attraction escalates, Christoph is torn. He can't keep lying, but will Daphne be able to trust him if he admits the truth about their union? 

From Harlequin Historical: Your romantic escape to the past.

The Wallflower Academy

Book 1: Least Likely to Win a Duke
Book 2: More Than a Match for the Earl
Book 3: The Duchess Charade
Book 4: The Prince's Wallflower Wife