You Only Live Twice

The story starts eight months after the murder of Tracy Bond, which occurred at the end of the previous novel, On Her Majesty’s Secret Service. James Bond is drinking and gambling heavily and making mistakes on his assignments when, as a last resort, he is sent to Japan on a semi-diplomatic mission.
Whilst there he is challenged by the Head of the Japanese Secret Service to kill Dr. Guntram Shatterhand. Bond realises that Shatterhand is Ernst Stavro Blofeld and sets out on a revenge mission to kill him and his wife, Irma Bunt.
The novel deals on a personal level with the change in Bond from a depressed man in mourning, to a man of action bent on revenge, to an amnesiac living as a Japanese fisherman.