A man leaps from a moving freight train carrying military explosives and hugs the ground as the rest of the train rolls past. His terrorist mission is almost complete, awaiting only the ignition of the timing device he placed somewhere amid the hazardous cargo. Authorities, alerted to the saboteur's plot, divert the train to a siding, initiate emergency evacuations of the surrounding area and call on bomb disposal expert Peter Lyncort to find the time fuse and disable it -- a perilous task that will unexpectedly grow more dangerous.