No Ordinary Love by Mary Balogh

The North Tower
Daphne Borland has inherited an old castle from her grandfather—provided she marries the earl of Everett, whom she has never met. She has never seen the castle either, yet she feels a deep connection to it as soon as she arrives there. As she awaits the arrival of the earl with trepidation, she gets caught up in the events and passions of long ago and finds herself falling deeply in love with a man who has been dead for a hundred years.

The Dark Rider
Malvern is an ancient house haunted by ghosts, but only a few people can actually feel and see them. Dinah Riddings, sent there to avoid the measles that have attacked her younger siblings, is one of them. As she feels the pain and longings of the dark rider and his lady, cruelly separated two centuries before, she also feels the pull of attraction to the master of the house, who looks incredibly like the dark rider.

The Heirloom
In order to celebrate his engagement, John Chandler drives his girlfriend from London to a remotely situated hotel in West Wales, once the home of his ancestors. However, when John produces her ring, an old family heirloom, and fits it on her finger, he finds himself catapulted back in time to become the John Chandler of Regency England, newly arrived at the house with his new wife—and dying of consumption.