Seeking respite after the traumatic events in the thirtieth century, the Doctor and Chris travel to 1950s London. But all is not well in bohemian Soho: racist attacks shatter the peace; gangs struggle for territory; and a bloodthirsty driverless cab stalks the night. As the stakes are raised, healing turns to killing, old friends appear in the strangest places - and even toys can have a sinister purpose.