The term 'The HOUND of the Baskervilles' is a novel by Sir Arthur Conan Doyle, first published in 1902. It is the third of four novels featuring the detective Sherlock Holmes. The novel follows Holmes and his companion Dr. Watson as they investigate the mysterious death of Sir Charles Baskerville. The title refers to a supernatural HOUND that is said to haunt the Baskerville family. The solution to the crossword is 'HOUND', which is a five-letter word.