Maisy Bartton finally moved from home and is on her own in a new town in a new apartment. Not long after being there she realized her shower shares a wall with her neighbor's shower. Her neighbor likes to sing when he showers. One day Maisy decides to join in on the singing. An odd friendship starts blooming between the two. Never meeting face to face, they pass notes under each other's door and continue singing with each other through their shared walls. Maisy hopes to one day gather the courage to meet him and little does she know but he feels the same way.