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.
Editions · 5
Paperback
1991 · Simon Pulse
EN
9780671730932
Paperback
1991 · Archway
EN
9789993315643
Paperback
1994 · Archway
152 pp · EN
9780671851651
Paperback
1996 · Pocket Books
160 pp · EN
9780671851651
Paperback
1999 · Tandem Library
EN
9780613064613
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