Eyjafjalla, the Icelandic volcano, has erupted. The European air traffic collapses. Álvaro has to interrupt his flight to Madrid. He decides to continue by train, starting his trip in Athens. He knows a group of people doing interrail; Berta, a young Swedish girl, among them. Álvaro initiates in a world full of new things for him: the pleasure of travelling by train, the parties at the youth hostels, love in a Croatian island…