The Perks of Being a Duke by Hanna Hamilton

His favorite place was inside her heart…

Forced to flee the atrocities of war, talented seamstress Celeste Singer takes up work in the service of the Duke of Gwendonmyre, in the hopes of saving up enough money to pay her parents’ passage from France to England.
Preferring the English countryside to London, Jonathan Harper, Duke of Gwendonmyre, sees his up-until-then pristine family life turned on its head when a series of near-fatal accidents start happening around the manor.
As maids go missing, poisonous food finds its way to his table and large sums of money simply disappear, Jonathan is hard-pressed to find answers.
And it all seems to be connected to the one person he holds new-found affection for: soft-spoken maid, Celeste Singer…