From End of Casefile #9 -- The Hardys and Callie Shaw visit a terrorism seminar in Washington D.C., which also features a simulation of a terrorist plane hijacking. Shaw volunteers to be one of the passengers. But the experiment goes awry when a real terrorist group takes over the plane and threaten to blow it up. Worse, the authorities and Fenton Hardy order the boys off the case. The Hardys search the streets of D.C. for clues to the plotters-and time is ticking fast for Callie and her fellow passengers.

From back of book -- An antiterror convention in Washington, D.C., is rocked by a real-life hijacking -- and Frank's girlfriend, Callie Shaw, is among the hostages. When Callie appears on the TV news she sends the Hardys a coded message. Trouble is, the government doesn't believe them. Agent O'Neill orders Frank and Joe off the case, forcing them to try a rescue on their own. Suddenly the brother sleuths are running from the law, straight into a terrorist death trap -- while Callie watches her life tick away.