When Mary's son Zack brings an antique guitar to Sparrow Island, it's mysterious history sets off a search for a music legend-and a rare colony of bats. A student whose life was changed by Abby's mistake years ago joins in the search, but will old woulds distance them once again? Meanwhile, Mary discovers her deceased husband's unpublished manuscript and unearths long-buried family secrets. As Abby searches for the bats and struggles to untangle the hisotory of the famous instrument, she also learns that forgiveness and love can heal even the deepest rifts.