Eight-year-old triplets Emmy, Clare, and Giselle are excited to celebrate Founding Day, the day their dad found them and they became a family. The girls want this year’s celebration to be extra special. And Dad has a big surprise—trillium-petal charms that he found with the girls.

But when the girls’ little brother, Zee, slips into the river while helping them plan a special surprise, something magical happens: The charms are drawn together, forming a glowing flower, and the girls suddenly have superpowers! Channeling their new abilities, they work together to try to save Zee, but will they be able to figure out how to help in time?