Harriet (Lucy Boynton) finds art imitating life when she discovers certain songs can transport her back in time - literally. While she relives the past through romantic memories of her former boyfriend (David Corenswet), her time travelling collides with a burgeoning new love interest in the present (Justin H. Min). As she takes her journey through the hypnotic connection between music and memory, she wonders - even if she could change the past, should she?