Germany after WWI
This book is a fairly complete description of the situation in Germany at the end of the First World War, including the collapse of the German army, the Socialist agitation, the Old Order (big business, conservative politicians and army) plots against both democracy and socialist tendencies.
It tells the story of the shaping of the Weimar republic out of the ashes of the Second German Empire, the attempt at revolution by both the left wing of the Social Democrats and the Communists, the counterrevolutionary leaning of paramilitary Free Korps & Army and the compromises of the SDP leadership to prevent revolution and try to preserve the old order the knew, but turned into a "liberal" democracy.
All in all, a quite good appraisal of the subject, easy to read as well. As more progressive account of the same period I recommend Sebastian Haffner's "Failure of a Revolution: Germany 1918-1919".