Ellsworth, living with his widowed father, has never met any of his relatives, and his father won't say why. But on his thirteenth birthday he receives an invitation from an elderly cousin, Elizabeth, to return to the ancestral family home, ten houses on a Square. His father, very reluctantly, agrees to let him go.
Ellsworth has seen a picture of the Square, had strange dreams about it, and heard stories of the Treasures hidden there by his ancestor, John Matthew. But the Square, and his relatives who inhabit it, are devastated by fighting and loss, and are barely a family any longer. Of the three original Treasures, only one is left to be discovered, but perhaps the prescient John Matthew made arrangements for more than his descendants' financial well-being.