It's official "“ at 4,032 pages, all resting on a spine over a foot thick, the world's thickest book is The Complete Miss Marple. The massive volume, a collection of the 12 novels and 20 short stories by Agatha Christie featuring the guileless spinster detective, was revealed to the public at a press event at Foyle's Charing Cross Road bookshop in London on Wednesday, May 20. Taking part in the event was Christie's grandson and inheritor of her estate, Matthew Prichard,