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A noted professor accidentally invents a deadly virus, which the Hardys are transporting via train to a safe lab. When the professor's son is killed en route, Frank and Joe realize that one of the passengers is a spy--and would sell the lethal strain to the highest bidder.
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Editions
4 editions- Paperback · English · 1996Pocket Books · 160 pages · 9780671851651
- Paperback · English · 1991Simon Pulse · 9780671730932
- Paperback · English · 1991Archway · 9789993315643
- Other · English · 1999Tandem Library · 9780613064613
Fiction, media tie-inChildren's fictionFantasy fictionMystery and detective stories