The Royal Bodyguard by Lindsay Emory

When Princess Caroline of Drieden of the Royal House Laurent eloped with a race car driver, she forfeited her royal title and her family.
Now a widow and exiled from Drieden, Caroline is working as a journalist, writing exposes under a pen name. When, one day, she catches sight of her sister Thea’s ex-fiancé, she’s stunned – Christian is supposed to be dead. Here could be the scoop of the century.

But Caroline’s plans to uncover Christian’s deception are foiled by the arrival of Hugh Konnor – her former bodyguard and Caroline’s first – unrequited – love. When Hugh stubbornly refuses to leave her side, Caroline can’t deny they make a good team.
As they unravel a web of deception that could bring down the House of Laurent, Caroline must decide how far she’s willing to go to protect a family she feels deserted her – and whether the man who swore to guard her body can safely hold her heart.