The Governess and the Rogue by Mimi Matthews

A down-on-her-luck Victorian governess and an unrepentant rogue enter into a fake engagement during a lengthy voyage at sea in USA Today bestselling author Mimi Matthews’s sixth book in her acclaimed Somerset Stories series.
Stranded in India after being dismissed without a reference, governess Beatrice Layton exchanges her freedom for passage home to England, taking a position with the only family that will hire her. But Bea hasn’t reckoned for just how dreadful her new employers will be. Stuck with them at sea in increasingly desperate circumstances, she finds an unlikely champion in the injured ex-soldier traveling aboard their ship.
Colonel Jack Beresford has spent the last fourteen years serving in Her Majesty’s Army. Though time has lent him maturity, it hasn’t dulled the roguish impulses of his youth. When he’s confronted with the tantalizing prospect of a damsel in distress, he naturally steps in to rescue her. His solution? An engagement of convenience, of course. One that will last only as long as their voyage.
But once back on land, Jack and Bea’s simple arrangement is beset by complication after complication. There are former passengers to contend with, and meddling society matrons. Most complicated of all, there’s Jack’s family—his parents, siblings, and precocious nieces and nephews—all of whom seem to think that Bea might be perfect for him. Jack is beginning to think so too. All that remains is to convince bold, beguiling Bea that he’s perfect for her.