In the charming mountain town of Timber Coulee, Idaho, music shop owner Amanda Parrish's harmonious life strikes a discordant note when a beloved townsperson is murdered during the town's annual summer music camp.

As Amanda seeks for answers, she uncovers a web of long-buried secrets, including a mysterious violin and a charismatic newcomer with a hidden agenda. With the help of her spirited niece and a cast of colorful locals, Amanda must compose a solution to this deadly sonata before the killer's next movement brings her own story to a premature finale.