Every family has a past. This one has more than one.
The brick arch has stood at the edge of the Baird family farm for as long as Mae can remember. The animals have always refused to go near it. Then Mae finds a blue glass bottle beneath its shadow, bearing her name-and a frightened child's voice calls her Mum.
When Mae's eldest son returns from college, the arch begins opening paths through the farmhouse into other years. Rooms appear where walls should be. Photographs show a fourth child no one can explain. Even the family's memories begin to contradict one another.
The arch does more than carry people through time. It divides lives and rewrites the past. To bring her family home, Mae must discover what happened before the arch decides their future for them.