What if Churchill had not been made Prime Minister in 1940? Removed from the field of possibilities, an alternative in Lord Halifax falls into place, and an armistice or peace is signed with Hitler. No one is the wiser that this has taken place, for time has been magically altered. All is different now. This is the possibility that haunts Francis Spufford's latest novel and that its heroine must thwart. Iris is an unlikely candidate as saviour of Britain. She works as a secretary at a stockbroker's, is highly ambitious, wants to be rich, and she labours under an unexplained estrangement from her mother. She likes sex, has multiple male admirers, and is definitely aiming to 'marry up'', curbing her Watford vowels and having a side hustle so she can both dress well and afford to save for an investable nest egg. Yet, she must be careful; she does not want to be caught by a man who might curb her freedom and throttle her ambition. She definitely does not want to fall ...