Delta Cita is an important figure in the Doctor's past: his Gallifreyan wife. To the Doctor's knowledge, Cita had died many years before the Last Great Time War. In reality, the ancient, but seemingly young woman lives among the Human race, hiding in plain sight. Fate steps into the equation, bringing Cita, the Doctor, and their childhood friend, the Master, back together in order to save millions of lives. Cita is faced with impossible choices and has to find a solution to the problem she has created. Except she sees no way out of the storm approaching them.