In the midst of a fierce storm, a carriage carrying Sir John Mayfield, Lady Marianna Mayfield, and her lady's companion careens off a narrow cliff road, changing their fates forever. When the wreckage is found, Sir John is gravely injured, and a woman is discovered unconscious wearing a valuable ring. As the woman regains consciousness in a strange house, she grapples with fragmented memories of the accident, unsettling dreams of a child in peril, and a deep mystery tied to the ring on her finger.

The year is 1901, and the hustle and bustle of the holidays is descending on New York's Fifth Avenue. For the first time in her privileged life, Adelaide Forsythe couldn’t be happier about the prospect of a quiet Christmas. That’s not to say her transition from Missto Mrs. has been without challenge. Though she doesn’t regret marrying for love instead of wealth, she feels woefully unprepared to run her own household. Then, on the first Sunday of Advent, winter winds bring surprising change, first through a young orphan boy and then a seasoned housekeeper who seems too good to be true.

When their father's death leaves them impoverished, Sarah Summers and her genteel sisters fear they will be forced to sell the house and separate to earn livelihoods as governesses or companions. Determined to stay together, Sarah convinces them to open their seaside home to guests to make ends meet and provide for their ailing mother. Instead of the elderly invalids they expect to receive, however, they find themselves hosting eligible gentlemen. Sarah is soon torn between a growing attraction to a mysterious Scottish widower and duty to her family.

1950. In the wake of the war, Audrey Clarkson leaves her manor house in England for a fresh start in America with her young son. As a widowed war bride, Audrey needs the support of her American in-laws, whom she has never met. But she arrives to find that her longtime friend Eve Dawson has been impersonating her for the past four years. Unraveling this deception will force Audrey and Eve’s secrets - and the complicated history of their friendship - to the surface.

Richard Brockwell, the younger son of Ivy Hill's most prominent family, hasn't been home for Christmas in years. He prefers to live in the London townhouse, far away from Brockwell Court, the old family secret that haunts him, and the shadows of his past mistakes. But then his mother threatens to stop funding his carefree life - unless he comes home for Christmas. Out of options, he sets out for Ivy Hill, planning to be back on a coach bound for London and his unencumbered bachelor life as soon as the festivities are over.