Everything in Its Time — Dee Davis

Years ago while vacationing in Scotland, Katherine St. Claire believed she'd found the love of her life. She shared a night of passion with a stranger, in a castle hotel called Duncreag. But come morning, her lover had disappeared. And she has spent the last eight years trying to convince herself it was all a dream...

Living in the fifteenth century, Lain Mackintosh remains haunted by the memory of his greatest love. Eight years ago, she disappeared, leaving behind a cairngorm earring as the only evidence of her existence. Iain's family wants him to stop pining for this fantasy woman and submit to a sensible marriage. But Katherine suddenly returns to him and reveals to him where -- and when she's from...