The fourth and final round between master criminal (and master of disguise) Carl Petersen, and the tenacious Bull-Dog Drummond.
A missing scientist, Robin Gaunt, and a missing extremely deadly poison, propel Drummond and his crew into another turbulent action story.
Although the first three adventures are stand-alone books in this Library, this novel is found here only in an omnibus. I have extracted it to stand beside the other three.
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