Just finished this book and can highly recommend it. I've read several from the author and picked this one up from the used book sale at local library -- first published in 2001, if I'm reading the copyright page correctly.

Her books are set in the Appalachians and sometimes (as with this one) pull details from her own family history. This one uses a Scottish folk song as its central thread, with intertwined family stories starting on Islay in the 1700s to present day. Hard to say more without telling it all -- go read it for yourself!