Anthony Powell: A Dance to the Music of Time (twelve novels)
Sarah Orne Jewett: The Country of Pointed Firs and Other Stories
Harper Lee: Go Set a Watchman
Tsao Hsueh-chin: Dream of the Red Chamber (aka The Story of the Stone)
Dostoyevsky: The Gambler, The Double, Notes from Underground
Mikhail Bulgakov: Heart of a Dog
It doesn't appear to be a long list, but Anthony Powell's series consists of twelve novels.