After the death of his wife, Martha, the Doctor has struggled to raise his daughter, Lily. He soon finds himself in a race with time as he is plunged into a mysterious chase with the future and the present. And as the day approaches for Lily's 19th birthday, the Doctor will find out how everything is connected with a key, given to him by Martha before her death. Even some things never stay lost for long.

The sequel to The Only Way.