
After everyone Huw has known either dies or moves away, and the town is reduced to a contaminated shell, he decides to leave, and tells the story of his life just before going away.

Huw's father is later killed in a mine explosion. She never overcomes her clandestine relationship with the local minister. One of Huw's three sisters, Angharad, marries the wealthy mine owner's son – whom she does not love – and the marriage is an unhappy one. After his eldest brother, Ivor, is killed in a mining accident, Huw moves in with his sister-in-law, Bronwen, with whom he has always been in love. His five brothers and his father are miners. Huw's academic ability sets him apart from his elder brothers and enables him to consider a future away from the dangerous coal mines. It tells the story of the Morgans, a respectable mining family of the South Wales Valleys, through the eyes of one of the sons, Huw Morgan. The novel is set in South Wales during the reign of Queen Victoria. In the United States, Llewellyn won the National Book Award for favourite novel of 1940, voted by members of the American Booksellers Association. Llewellyn gathered material for the novel from conversations with local mining families in Gilfach Goch.

The author had claimed that he based the book on his own personal experiences but this was found to be untrue after his death Llewellyn was English-born and spent little time in Wales, though he was of Welsh descent. How Green Was My Valley is a 1939 novel by Richard Llewellyn, narrated by Huw Morgan, the main character, about his Welsh family and the mining community in which they live.
