When Mya wakes up to a gloomy day, her grandpa asks her how she could make the day brighter. His simple question puts Mya into motion, and together with her little brother, Oliver, and neighbour Addie, she opens the Kindness Booth. Their plan is to spread some sunshine to the neighbours in her block of flats by helping them throughout the day. But what happens when the booth gets soaked in a downpour?