When a scientist learns that aliens in a parallel world are waging a secret war against the Earth, he disappears into the world and his children set out to find him.
Editions · 5
Paperback
1987 · Walker
143 pp · EN
9780802766861
Paperback
1989 · Avon Books
151 pp · EN
9780380705672
Paperback
1990 · Beaver
109 pp · EN
9780099609704
Paperback
2016 · ibooks, Incorporated
EN
9781596874800
Paperback
2021 · ibooks, Incorporated
138 pp · EN
9781596870024
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