When Mercy Garrett moves herself out of the family home, everyone determines not to notice. All she wants is space and silence. No clutter. Not even their cat, Desmond. But it turns out family life is impossible to escape - particularly when it's in your past. For Mercy it all begins in 1959, with a holiday to a cabin by a lake. It's the only one the Garretts will ever take, but its effects will ripple through the generations.