In 1989 the Berlin Wall fell. In that euphoric year Rory MacLean travelled from Berlin to Moscow, exploring the forgotten half of Europe. Thirty years on MacLean retraces his original journey backwards, across countries confronting old ghosts and new fears: from revanchist Russia through Ukraine's bloodlands, to Poland, Germany and the UK. As Europe sleepwalks into a perilous new age, he explores how opportunists - from Putin to Home Counties populists - have made a joke of truth. MacLean asks what happened to the optimism of 1989 and, in the shadow of Brexit, chronicles the collapse of the European dream.