On her 21st birthday, gifted cellist Iona Muir receives a package from her estranged father containing a letter from her mother, Grace, a talented musician who tragically died ten years earlier. Reeling from what she reads, Iona soon discovers a mysterious, faded photograph of Grace, hidden inside her cello case.

Honoring her mother's request, Iona visits Grace's beloved music teacher, taking the first step on an emotional trail of discovery that has been left for her. As Grace's story unfolds, Iona gains a deeper insight into the mother she lost and the heartbreaking truth about Grace’s last months. The more Iona learns, the more she is drawn back to her family home, on the remote Scottish island of Orkney, and to her father.