May 1944: Mary is on the way back from work from a factory in the Gorbals, Glasgow. This trip is to prove different from any other. While heading back into the city centre, she innocently finds a white envelope on the tram. Unknown to Mary this envelope leads her into a world of espionage, spies and strange agents, Soon she is press-ganged into taking a message to a man in London, named Mr Wallenberg. She knows something big is going to happen next month, June 1944. She has to do it though. It is strange when she finds out things are not what they appear to be.