The Mystery Of Plan 'B6'
Written by
G. H. Teed
Copyright 1935
First published in Detective Weekly #116, May 11, 1935. Collected in .
"Spies Ltd., guided by the cunning hand of Dario Pless, master spy, again stir up a seething cauldron of plotting and intrigue. The War Office's most vital secret is in danger-and its safety depends on the daring and swift action of one man."