Sisters Hester and Harriet are reluctantly driving to visit relatives when they come across a young woman hiding with her baby in a bus shelter. Seeing the perfect excuse for returning to their own warm hearth, the pair insist on bringing Daria and Milo home with them.

But with the arrival of a sinister stranger looking for a girl with a baby, followed quickly by their cousins' churlish fifteen-year-old son, Ben, who also appears to be seeking sanctuary, Hester and Harriet's carefully crafted peace and quiet quickly begins to fall apart. And, perhaps, that's exactly what they need...