Plot summary
The first man to pass close to Mars is driven insane by strange 'voices' he hears on his radio. He is unable to record the voices as the Van Allen radiation belts wipe the magnetic tapes clean, so doubt is cast on his account. U.N.E.X.A. (United Nations Exploration Agency) send their crack team (Chris Godfrey, Serge Smyslov, Morrey Kant and Tony Hale) to investigate. After landing on the planet's surface they find traces of an ancient civilization, but then a disembodied Martian appears and demands its people be transported to Earth, where they will enslave the human race. One-by-one the crew are taken over.
This novel introduces the concept of the Ion drive, allowing continuous acceleration of one-fifth g.
Donald Allen Wollheim was an American science fiction editor, publisher, writer, and fan. As an author, he published under his own name as well as under pseudonyms, including David Grinnell.
Hugh Walters was a British writer of juvenile science fiction novels from Bradley in the West Midlands region of the United Kingdom.
Blast Off at Woomera is a children's science fiction novel, the first in the Chris Godfrey of U.N.E.X.A. series by British author Hugh Walters. It was published in the UK by Faber in 1957, in the USA by Criterion Books in 1958, and in the Netherlands in 1960 by Prisma Juniores.
The Domes of Pico is a juvenile science fiction novel, the second in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1958, in the US by Criterion Books in 1959 under the title Menace from the Moon and in the Netherlands by Prisma Juniores as 'De Maan Valt Aan' in 1960.
Operation Columbus is a juvenile science fiction novel, the third in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1959, in the US by Criterion Books in 1960 under the title First on the Moon, and in the Netherlands by Prisma Juniores as 'Wedloop naar de Maan' 1963.
Moon Base One is a young adult science fiction novel, the fourth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1960, in the US by Criterion Books in 1962 under the title Outpost on the Moon.
Expedition Venus is a juvenile science fiction novel, the fifth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1962 and in the US by Criterion Books in 1963.
Terror by Satellite is a juvenile science fiction novel, the seventh in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in 1964, in the UK by Faber and in the US by Criterion Books. Later published in Portugal by Galeria panorama under the name Pânico no satélite
Journey to Jupiter is a juvenile science fiction novel, the eighth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1965 and in the US by Criterion Books in 1966.
Mission to Mercury is a juvenile science fiction novel, the ninth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in 1965 in the UK by Faber and in the US by Criterion Books. Also published under the name Missão Mercúrio in Portugal by Galeria Panorama.
Spaceship to Saturn is a juvenile science fiction novel, the tenth in Hugh Walters' "Chris Godfrey of U.N.E.X.A." series. It was published in 1967 in the UK by Faber and in the US by Criterion Books and in Portugal under the title Voo para Saturno by Edições Dêagã in 1975.
Nearly Neptune is a juvenile science fiction novel by British writer Hugh Walters, the twelfth in his Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1969 and in the US by Washburn Books under the title Neptune One is Missing.
First Contact? is a juvenile science fiction novel, the thirteenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series.
Passage to Pluto is a juvenile science fiction novel, the fourteenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series.
Tony Hale, Space Detective is a juvenile science fiction novel, the fifteenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1973.
Murder on Mars is a juvenile science fiction novel, the sixteenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1975. It was the second in the series to switch to detective work rather than space exploration.
The Caves of Drach is a juvenile science fiction novel, the seventeenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1977.
The Last Disaster is a juvenile science fiction novel, the eighteenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1978
The Dark Triangle is a juvenile science fiction novel, the twentieth and last published in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber in 1979. One final book - The Glass Men - was written, but was never published.
The Blue Aura is a juvenile science fiction novel, the nineteenth in Hugh Walters' Chris Godfrey of U.N.E.X.A. series. It was published in the UK by Faber and Faber in 1979.
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