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. Original.
About Franklin W. Dixon
See more books from this Author
Published November 1, 1991
by Simon Pulse.
Young Adult, Literature & Fiction.