Since the publication of her first novel in 1920, more than two billion copies of Agatha Christie's novels have been sold around the world. Now, for the first time ever, the guardians of her legacy have approved a brand-new novel featuring Dame Agatha's most beloved creation, Hercule Poirot. In the hands of internationally bestselling author Sophie Hannah, Poirot plunges into a mystery set in 1920s London – a diabolically clever puzzle sure to baffle and delight both Christie's fans as well as readers who have not yet read her work. Written with the full backing of Christie's family, and featuring the most iconic detective of all time, this new novel is a major event for mystery lovers the world over.