She needs a headliner. He needs a break. Neither of them needs the sparks they can't ignore.

Maddie Fields has dedicated her life to teaching music and inspiring her students in Juniper Falls. But when the headliner for her charity concert bails, she's left with no choice but to turn to the one person she never thought she'd see again—Alex Whitaker, her high school crush turned world-famous rock star.

Alex came back to Juniper Falls to escape the chaos of his career, not to relive old memories or take on new commitments. When Maddie asks for his help, he's ready to say no—until her fiery determination (and a little guilt) changes his mind.

As they're forced to work together, Alex's big-city bravado and Maddie's small-town practicality clash at every turn. Yet the more time they spend together, the more they realize their differences might just make them the perfect harmony.

But with Alex's career pulling him in one direction and Maddie's roots holding her in another, their past and future collide in a crescendo of emotions. Can they face the music and find a way to stay in tune—or will they end on a bitter note?

Heartstrings in Harmony is a heartwarming rivals-to-lovers romance filled with playful banter, a touch of nostalgia, and the sweet melody of second chances.