Serial: Daredevils of the Red Circle, 1939

After escaping, diabolical genius Harry Crowel, also known as Prisoner 39013, sets out to destroy all of businessman Horace Granville's possessions, which is why he was imprisoned. He does this with an apparently limitless supply of minions. The amusement park where the three Daredevils of the Red Circle perform death-defying stunts is one objective. Our three heroes vow to apprehend No. 39013 because they are horrified by the loss of innocent lives. The villain is holding the genuine Granville captive and has replaced him with an almost flawless disguise, so it will be more difficult than they think!
Chapter titles:
1. The Monstrous Plot
2. The Mysterious Friend
3. The Executioner
4. Sabotage
5. The Ray of Death
6. Thirty Seconds to Live
7. The Flooded Mine
8. S.O.S.
9. Ladder of Peril
10. The Infernal Machine
11. The Red Circle Speaks
12. Flight to Doom