Keynes wrote the book in the autumn of 1919, soon after resigning as the Treasury's representative at the Paris Peace Conference in protest at the terms being drafted. He opens by warning that Europeans mistook the unusual prosperity of the half century before 1914 for something natural and permanent. That order rested on a fragile, interconnected machinery of population, capital, trade, and imported food, and the war had already shaken it. The peace, he argues, threatened to complete the ruin that Germany had begun.
The early chapters describe the Europe that the war broke and the conference that judged it. The continent had grown dense and could no longer feed itself; it lived by a finely balanced system in which Germany was the industrial hub whose trade sustained its neighbors. Against this picture Keynes sets the atmosphere of Paris, which he calls a nightmare of frivolity and impending catastrophe, where the Council of Four settled the fate of millions in arid intrigue while reports of hunger and collapse arrived from across Central and Eastern Europe.
At the center of the book are Keynes's portraits of the men who made the Treaty. Clemenceau, the most formidable of the four, wanted above all to weaken Germany so that France need never fear her again, a policy Keynes names a Carthaginian peace. Wilson arrived with unmatched moral prestige and the Fourteen Points, but Keynes depicts him as a slow, obstinate man outplayed by sharper negotiators, his principles quietly abandoned. Lloyd George darts between them, seeking a settlement that would satisfy opinion at home. The result bore the marks of all three and the wisdom of none.
The technical heart of the argument concerns reparations. The Treaty named no fixed figure and handed the question to a Reparation Commission, but the sums being discussed ran far beyond anything Germany could realistically deliver. Keynes examines her likely exports, her merchant shipping, her foreign investments, and her coal and iron, stripped away by territorial losses, and concludes that the practical capacity to pay was a small fraction of the claims. To demand more, he argues, was to ask for transfers the world economy could not absorb, while crippling the very industry that any payment would have to come from.
The final chapters turn from criticism to consequence and remedy. A Europe left starving and disordered, Keynes warns, will not endure quietly; economic privation could submerge civilization itself. He proposes revising the Treaty's reparation clauses to a figure Germany can meet, cancelling the tangle of inter-Ally war debts, floating an international loan to restart currencies and trade, and reopening commerce between Germany and Russia. The near future, he writes, is no longer in the hands of statesmen, and the only lasting remedy is to change opinion through the assertion of truth and the dissipation of hate.