It is 1922, and London is tense. Ex-servicemen are disillusioned, the out-of-work and the hungry are demanding change. And in South London, in a genteel Camberwell villa, a large silent house now bereft of brothers, husband and even servants, life is about to be transformed, as impoverished widow Mrs Wray and her spinster daughter, Frances, are obliged to take in lodgers.

"The Louis XVI Hotel on the rue Boissy d'Anglas just off the Faubourg St. Honore in Paris had been closed for renovations for four years. The street it was on was particularly appropriate, open only to foot traffic. It was guarded by a policeman, who would open the barrier for a car to pass carrying an important person, or guests of the exclusive hotel. Smaller than the grand 'palaces', the five-star hotels of Paris, it was a favorite among those...