Plot: The summer of 1986 begins on a promising note for Erfurt sisters Catrin and Maja Streesemann – they’ve finally received a travel permit for their first holiday at Lake Balaton. The only thing is, they have no idea that they’re being watched by the Stasi as the spies in swimming trunks of the Balaton Brigade have been watching out for East Germans attempting to escape to the West, with the holiday resort as a starting point