After a decade of economic crises and political turmoil, stalled halfway between national and regional sovereignty, Europe is no longer sailing proudly forward but drifting aimlessly close to dangerous shoals. To provide intellectual context in this time of choosing, as Europe looks to either continue or abandon its quest for ever-greater collaboration and openness, we offer this collection devoted to three of the continent's crucial interlocking challenges-immigration, terrorism, and populist nationalism. Europe has absorbed large numbers of refugees from Syria and other countries in recent years, experienced repeated devastating terrorist attacks, and turned inward as a result. Foreign Affairs has been tracking each of these issues in real time, and we gather the best of our coverage here for handy reference.