All's Fair in Love and War (Miss Prentice's Protegees, 1) by Virginia Heath

In the first installment of a Regency romp of a series, a governess who believes in cultivating joy in her charges clashes with the children’s uncle who hired her, only to find herself falling in love.

When Harry Kincaid’s flighty older sister decides to join her husband on an Egyptian expedition, Harry, a former naval captain, is left in the lurch, minding her three unruly children and giant, mad dog. But Harry has a busy career at the Admiralty that requires all his attention, and he has no clue how to manage the little rascals or when his sister is coming back. In desperation, he goes to Miss Prentice’s School for Young Ladies prepared to pay whatever it takes to hire an emergency governess quick sharp to ensure everything in his formerly ordered house is run shipshape again.

Thanks to her miserable, strict upbringing, fledgling governess Georgie Rowe does not subscribe to the ethos that children should be seen and not heard. She believes childhood should be everything hers wasn’t―filled with laughter, adventure, and discovery. Thankfully, the three Pendleton children she has been tasked with looking after are already delightfully bohemian and instantly embrace her unconventional educational approach. Their staid, stickler-for-the-rules uncle, however, is another matter entirely.

Georgie and Harry continue to butt heads over their differences, but with time it seems that in this case, their attraction is undeniable―and all is indeed fair in love and war.