What unfinished German novel comes in three volumes and is considered the most influential modernist novel?
Robert Musil:  His unfinished novel "The Man Without Qualities" (German: "Der Mann ohne Eigenschaften" ) is generally considered to be one of the most important and influential modernist novels. The Man Without Qualities: The Man Without Qualities (1930–43; German: "Der Mann ohne Eigenschaften") is an unfinished modernist novel in three volumes and various drafts, by the late Austrian writer Robert Musil.
The Man Without Qualities