1st of 2 graphic adventures from Thriller Picture Library #242, September 1958 - 42 pages.
Reprinted in Spy 13 Summer Special #1, June 1966.
The day that the UK declared war on Germany in 1939, the hunt started to round up all known German agents in Great Britain. Spy 13 was one of three key agents told to find out who the enemy's top spy in the country was. An anonymous phone tip offered that intel for a price but when Spy 13 arrived at the meeting, the informant was dead. That is when Spy 13 starts to show why he was so respected.