[2] The story begins when a Belgian journalist, Hugo van Eyck (Jerome Willis), broadcasts a documentary about Nazi war criminals, and investigates the whereabouts of the former Chief of Gestapo and SS of Belgium, Standartenführer Kessler (who had been promoted from Sturmbannführer during the final series of preceding drama Secret Army, set during the war, over 30 years before).

Van Eyck has a high media profile in Belgium and soon develops an investigation into Kessler (Clifford Rose) with the help of West German intelligence officer Richard Bauer (Alan Dobie).

Kessler has changed his name to Manfred Dorf and is now a rich industrialist, with factories manufacturing plastics, explosives, and pharmaceutical products.

His wartime Belgian mistress Madeleine Duclos (Hazel McBride) is deceased, but after the war the couple married and had a daughter, Ingrid (Alison Glennie).

They loosely resemble an aged Fourth Reich, compelled with the idea of an anticipated ascendancy of the German state and Volk, a foreseen future referred to as Der Tag (literally 'The Day').

Mostly made up of aging, World War II Nazi veterans, the organisation is apparently large, endowed and very dangerous in the drama to those who cross them or who try to make their existence known publicly.

The Kameradenwerk is active in Germany and Europe, keeping a huge sum of Nazi loot funds, furthered by the financial successes of Kessler.

In Brussels, van Eyck invites three of the prominent Lifeline (a Second World War escape line) partners, who were Secret Army series characters, to his television studios: Albert Foiret (Bernard Hepton), Monique Durnford (née Duchamps) (Angela Richards), and Natalie Chantrens (Juliet Hammond-Hill).

When the interference is realised and it is known the incriminating photo album was seen, Kessler, Ruckert, Franz and Ingrid travel to Paraguay, and Bauer and Mical set off in pursuit.

Kessler and Ruckert stay with a Nazi-sympathizing Paraguayan aristocrat, Don Julian Yqueras (played by Guy Rolfe, who previously appeared in the Secret Army episode, "Russian Roulette" as Oberst von Elmendorf).

Realizing that his dream of a new Nazi dawn is over, and having lost the one thing (their daughter Ingrid) that he had left of Madeleine, Kessler shoots himself in the mouth using Bauer's machine gun.

Many former Secret Army production personnel were involved with Kessler, including producer Gerard Glaister, writer John Brason and directors Michael E. Briant and Tristan de Vere Cole.