Ada is Vladimir Nabokov's longest novel. It was met with mixed reactions upon publication in 1969.
The book tells the story of Van Veen's love for Ada, his sister. Meeting as cousins (or so they thought) at a young age, the pair fall into a sexual relationship and only later discover the true nature of their familial link. Van's thoughts are revealed through his memoirs, later annotated by both him and his sister.
Nabokov is well known for his short stories, as well as his English language novels such as Lolita (1955), another controversial story.