sentences:  Christie was determined to turn the book, which both she and Rosalind liked, into a play but was equally adamant that in doing so it would lose the character of Hercule Poirot whose appearance in the book she thought had "ruined it".The parts of the policemen were changed from the book as well from Inspector Grange and Sergeant Clark to Inspector Colquohoun and Detective Sergeant Penny.Bertie Meyer, a backer of plays whose association with Christie's stage works dated back to "Alibi" in 1928, signed a contract to produce "The Hollow" in 1950 and plans were made with Christie's agent, Edmund Cork, to open the play in London to coincide with the start of the Festival of Britain.