William Collins, Sons & Co Ltd

William Collins, Sons & Co Ltd, (PROSE: "Agatha Christie's Letter to Sir Godfrey Collins") published The Murder of Roger Ackroyd by Agatha Christie under the banner Collins Detective Novels. Lady Eddison read a copy of the book in 1926. (TV: The Unicorn and the Wasp)

Behind the scenes
In the real world, Collins began publishing Agatha Christie books in 1926 starting with The Murder of Roger Ackroyd.