Lost in the East End of London, TV repairman Gary Sparrow walks down Ducketts Passage, through a time warp into 1940. In the Royal Oak pub there, without either gasmask or identity papers, he is suspected of being a spy. His eye is drawn by the barmaid Phoebe, but she is a married woman whose husband is away in the war. In the cellar during an air raid he teaches the pub regulars some songs. He also helps Eric, Phoebe's father, who is injured during the raid. But what will he tell his wife Yvonne, when, and if, he gets home?