A young man finds that his old science teacher and benefactor, Professor Colson, is in contact with another world. The information the Professor is receiving has made him rich, but has also made him a powerful enemy who will stop at nothing to discover the Professor's secret and use it for his own ends.Planetoid 127 is one of the earliest examples of the 'twin worlds' science fiction theme, in combination with the traditional crime/thriller genre of which Edgar Wallace was an acknowledged master.