When Mary's father, the miller, leaves his family and runs away with another woman, Mary and her siblings are left to weather the storm. But when their mother dies soon after, the children, alone and unwanted, are sent to the Foundling School for Girls to start a new life.

When the miller learns of his wife's death and what has happened to his children, he tracks them down and brings them to be a part of his new family, safe at last. But the miller is desperate for a son, and when Mary's newest sibling turns out to be a girl, he begins to court a vulnerable and lonely young woman called Isabel.

After Isabel gives birth to a boy, the miller believes that the son he has been waiting for is finally here. But when rumours abound that the miller may not be the father of Isabel's child, he begins to lose control. The miller will stop at nothing to keep his son.

Will Isabel escape with her child, or will the miller's wrath destroy everyone in his life, including his daughter...?