The Menace of Mars and Other Stories is a collection of three novelettes by Clare Winger Harris, writer of mystical science fiction of universes within universes.

A Runaway World (1926) – Our Earth, an Infinitesimal Electron in the Vast Cosmos, is Subjected to a Dire Chemical Experiment

A nine chapter novelette.

The Fate of the Poseidonia (1927) – Third Prize winner of the December, 1926 Amazing Stories writing contest.

A six chapter novelette.

The Menace of Mars (1928) – Malign matter and cosmic chemistry.

A sixteen chapter novelette.