In Restless Dreams. The SpiritSense Series, #1

It's been a year since Suzy Quinn lost her husband and young daughter in a boating accident. Now, she spends most of her time alone in her family's estate on Massachusetts' North Shore. After Suzy, an amateur genealogist, makes a horrifying discovery under the floorboards of the carriage house, she finds that she has an unsettling new ability. She mystically followed her ancestor to nineteenth-century Edinburgh, through romance and tragedy, and into the dark and dangerous underground vaults.
As Suzy physically pursues the clues to Old Town Edinburgh, she comes face-to-face with her past, discovering in the process that some family histories are hidden for a reason.