Edgar Wallace enjoyed writing science fiction. „Planetoid 127", first published in 1929 but reprinted as late 1962, is a short story about an Earth scientist who communicates via wireless with his counterpart on a duplicate Earth orbiting unseen because it is on the opposite side of the Sun. The idea of a mirror Earth or mirror Universe later became a standard subgenre within science fiction. The story also bears similarities to Rudyard Kipling's hard science fiction story „Wireless". As we see the first of the two stories, „Planetoid 127", is science fiction whilst the second, „The Sweizer Pump", is a crime story. Fast-paced, with good twists and turns, an unusual criminal scheme.