After growing up as an orphan, Millie Longfellow is determined to become the best nanny the East Coast has ever seen. Unfortunately, her playfulness and enthusiasm aren't always well-received, and she finds herself dismissed from yet another position.

Everett Mulberry has quite unexpectedly become the guardian of three children that scare off every nanny he hires. About to depart for Newport, Rhode Island, for the summer, he's desperate for competent childcare.

At wit's end with both Millie and Everett, the employment agency gives them one last chance—with each other. As Millie falls in love with her mischievous charges, Everett focuses on achieving the coveted societal status of the upper echelons. But as he investigates the suspicious circumstances surrounding the death of the children's parents, will it take the loss of those he loves to learn whose company he truly wants for the rest of his life?