6.3 Tunnel of Fear by John Dorney, from a storyline by John Kruse
Southend. A perfect spot for a family holiday - or for a traitor to hide.
Somewhere in the town lurks a spy ring that is smuggling out classified information. When his old mole is attacked, and with innocent lives at risk, Steed takes Keel to the seaside for a far from sunny time.
This excerpt is taken from The Avengers: The Lost Episodes Volume 06.