Sixteen-year-old twins Harry and Barry stumble across a gateway to another universe, where a distortion in time and space causes a dramatic change in their competitive relationship.
Editions · 5
Paperback
1986 · Bantam Books
198 pp · EN
9780553256277
Paperback
1988 · Macdonald
144 pp · EN
9780356139913
Paperback
1995 · Puffin
176 pp · EN
9780140375985
Hardback
1997 · Peter Smith Publisher
EN
9780844669038
Hardback
1999 · Tandem Library
EN
9780808575238
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