The Hands of Time by Irina Shapiro

When a young woman vanishes without a trace from a quaint fishing village on the coast of England, only one person knows the truth, but he remains silent allowing the authorities to search for her in vain. Meanwhile, Valerie Crane finds herself transported to the year 1605. Terrified and confused, she turns for help to the Whitfield brothers, who take her in and offer her a home. Both Alexander and Finlay Whitfield fall in love with the mysterious woman, who shows up on their doorstep, creating a love triangle that threatens to consume them all. Valerie must make her choice, deciding between the brother who will lead her down the path of destruction, or one who will give her a love she couldn’t find in her own time.