What is considered by literary critics to be the first full length English detective novel?

The 1868 book "The Moonstone" by Wilkie Collins is considered by literary critics and others to be the first full length English detective novel. This work in English began when it was serialized in Great Britain and the United States in Charles Dickens' magazine 'All the Year Round' and in the year round 'Harper's Weekly' magazine. It was specifically published in book form in July 1868.

History has shown that the novel (The Moonstone) created many of the ground rules and plot ideas that are typically used in detective novels. Also, 'The Moonstone' reflected Collins' enlightened social attitudes on how people should treatment servants who work for them.

The novel was liked so much by readers that Collins adapted 'The Moonstone' for the stage in 1877. The production was performed and lasted in the theater for just two months.The story line was told by a series of narratives. Some of the key characters and the complex plot trace the efforts being made to explain the theft of a diamond, identify the thief, and recover the stone for its true owner.