A stitch in time / Kelley Armstrong.

Enhanced descriptions from Syndetics:

"Thorne Manor has always been haunted and it has always haunted Bronwyn Dale. As a young girl, Bronwyn could pass through a time slip in her great-aunt's house, where she'd visit William Thorne, a boy her own age, born two centuries earlier. In the wake of a family tragedy, the house was shuttered and Bronwyn was convinced that William existed only in her imagination. Twenty years later, Bronwyn inherits Thorne Manor, exactly when she needs it most, her life stalled since her young husband's death years earlier. And when she returns, William is waiting. William Thorne is no longer the calm and quiet boy she remembers. He's a difficult and tempestuous man, his own life marred by a tragedy and scandal that had him retreating to self-imposed exile in his beloved moors. He's also none too pleased with Bronwyn for abandoning him all those years ago. As their friendship rekindles and sparks into something more, Bronwyn must also deal with ghosts in the present version of the house, and soon she realizes they are linked to William and the secret scandal that drove him back to Thorne Manor."--Publisher.

Reviews provided by Syndetics

Publishers Weekly Review

This well-crafted supernatural romance from suspense author Armstrong (Every Step She Takes) offers escapist thrills aplenty but ignores the issues underpinning its plot. When Bronwyn Dale inherits her great-aunt's Yorkshire manor, memories from her childhood visits come flooding back--and with them decades-old trauma. As a child, a "stitch in time" in the house allowed Bronwyn to travel between her present and the 19th century, where she befriended William Thorne, the child of the manor's Victorian era owners. At 15, their friendship blossomed into romance--until a terrifying ghostly encounter in the modern day leads to Bronwyn's great-uncle's death. Grief-stricken, Bronwyn finally told her parents about time traveling and seeing ghosts--resulting in her parents committing her to a psychiatric hospital where the doctors successfully convinced her that neither the ghost nor William were real. Now, 23 years later, Bronwyn must face her past and solve the mysteries that haunt Thorne Manor, all while she and William rekindle their impossible relationship. The gripping plot and thoughtful characters are mildly undermined by the way Armstrong blithely glosses over the paradoxes of time travel, the implications of a series of gruesome murders in William's time, and the hospital's gaslighting of Bronwyn. Still, readers looking to escape into a taut, sexy mystery will enjoy. (Oct.)