London—20 September 1940 Summary

Polly notices the drop location has debris on top but isn't damaged itself. As she tries to climb onto the pile of debris, a raid warden catches her and sends her away. She waits for the warden to leave and then sneaks back, lowering herself into the alleyway and then through the cellar door. Polly waits for the drop to open but it doesn't, so she has to .

London—20 September 1940 Analysis

It seems as if the historians that alerting history where they are is affecting the other historians. This can be the reason why the drop isn't opening for several different historians that are in different locations but during the same time period as those historians who are altering history.