Steed drives a train, Emma is tied to the tracks.
Scientist Peter Brady is inadvertently rendered invisible during a botched lab experiment.
A shady businessman collapses on an oceanside jetty, the apparent victim of a heart attack, but a vacationing March discovers blood and a needle near the body. A little boy's lost ball may be the key to a possible murder.
Peter must infiltrate an embassy to rescue a Russian scientist who wants to defect.
