Bartholomew is a historian, a time traveler that records past events. For his final test, he thought he was assigned to the apostle Saint Paul. However, he was to go to St. Paul's church in 1940 England during the London Blitz. There, he stands as a fire watch, a person that extinguishes bombs and hazards at St. Paul's church. What is his mission? Nobody really knows for sure, not even him. 

He meets Langby, Enola, and a black and white cat. Langby is another fire watch guard, who's peculiar disposition makes Bartholomew suspicious of his intentions of keeping the church safe. Enola is another victim of the bombing, and as she moves around England with her troublesome brother, she occasionally returns to see Bartholomew. And slowly, Bartholomew learns to care about the people around him. All while haunted by the knowledge of what's to come with the Blitzkrieg. He came equipped with facts about the 1940s, but there are no history books about Enola or Langby. Is it possible to save people who have already died? 

As his test wraps up, a bombing raid hits London, and he remembers one vital fact. History recorded 18 casualties in the subway that day, and Enola was heading straight for it. Despite his best efforts, he cannot find her. As he heads back, he sees smoke rising from the church, and races home; only to find that Langby has saved them by shielding a bomb with his body. His last words to Bartholomew were accusing him of being the spy. As he heads back into the future, Bartholomew questions what was the lesson of this final test? Maybe there is no purpose except just to see how fruitless one's efforts are. He passes and moves on in his career as a historian, carrying with him the memories of being a fire watch during the London Blitz.