Evie and Maryam are in the same class at school, uneasily thrown together at the start of a new term as they start a project together looking into their family trees. The two girls don't think they have much in common - Maryam feels like an outsider, and Evie thinks Maryam is a bit odd.

But when the two girls each find the same mysterious folder containing documents in a secret language that belong to their grandmothers, they discover their ties go back two generations…