His Grace, Her Duke by Emma Linfield

“How am I meant to work together with a man like that?”

How could Duke Derek know that visiting his friend would turn into absolute chaos? With the hostess ill, the governess gone, and his friend called away, Derek is on his way out when the most beautiful lady he has ever met arrives in a flurry of impropriety, stopping him in his tracks.
When Grace Hughes receives a desperate letter from her sister, she knows she must go help take care of her niece and nephew. And she would have probably loved it too if it weren’t for the enragingly proper duke offering his unwanted help!
Shouldering the responsibility of the Lush children, they find it impossible to work together. Whether they are butting heads or completely besotted by one another, neither can tell which is their true distraction. Only that it stops them from realizing the trap being set up for them, and the grave danger it might bring…