Frank and Joe join Andrew Driscoll, the son of a professor, on a critical cross-country train ride. They are acting as decoys in a top-secret plan to transport a deadly virus from San Francisco to Chicago. But the plan goes wrong when Andrew disappears.

 

This is number 57 in Hardy Boys Casefiles .

There are 160 pages in this book. This book was published 1994 by Simon & Schuster .

Franklin W. Dixon is the author of the ever-popular Hardy Boys books.