John Leslie Palmer (1885-1944) and Hilary St George Saunders (1898-1951).
Germany around 1930, when Hitler was gaining ground but not yet in power; across Europe a series of inexplicable disasters is worrying governments: trains crashing, airliners falling out of the sky. It appears to be sabotage, but how?
The secret services of Germany, France, and Britain, co-operate to track down the culprits.
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